How to determine the exact date of conception. How to calculate the best time to conceive using a calendar

The development of pregnancy begins with the fertilization of an egg by a sperm. The day of their merger is considered the date of conception of the unborn child. There are various methods for calculating the date of possible fertilization, all of which are based on determining the day of ovulation - the moment the egg matures.

Exact day of conception: how to find out

Favorable days for conceiving a child

It is believed that a woman can only become pregnant during ovulation. At this time, the fertilized egg leaves the ovary into the uterine cavity. She lives no more than 48 hours, so a couple may not have much time to conceive a child during one menstrual cycle.

Male sperm, once in the vagina, can live for about seven days at best. Therefore, conception is possible only a few days before ovulation, as well as on the day the egg is released into the uterine cavity.

How to find out the exact date of conception

To find out when conception occurred, you need to find out the date of ovulation and compare it with the day when unprotected sexual intercourse occurred.

To calculate the exact day of fertilization, you can use a special calculator, finding it on websites about pregnancy and childbirth, but it’s easy to do it yourself.

If a woman monitored her ovulation, it is very easy to determine the exact date of conception. This will be the day on which the closest sexual intercourse occurred to this date.

Calculating the date of ovulation is possible by measuring basal body temperature, using ultrasound, blood tests for hormone levels, and using diagnostic rapid tests to determine ovulation.

On the basal temperature chart, the day of ovulation is the moment the line of the measured indicator transitions to a higher level (temperature rise by 0.3–0.5 degrees)

If a woman did not monitor the onset of ovulation, it will be somewhat more difficult to determine the exact date of conception. An egg ready for fertilization is released from the ovary approximately in the middle of the menstrual cycle. The duration of the period between the onset of menstruation varies among different women and can range from 24 to 40 days, so both early and late ovulation are possible. In most cases, it happens 14 days before the expected menstruation date.

When going to the antenatal clinic, the doctor informs the woman about the duration of her pregnancy. You can find out (if the start date of the last menstruation and the moment of ovulation are unknown) by the results of a gynecological examination or ultrasound data. Based on the established period, it is possible to calculate the date of expected birth. Using this data, using a special formula, you can find out on what day conception occurred. You need to count a week from the date of birth and add three months and two weeks to the resulting number. On the resulting day, fertilization most likely occurred. However, please note that this result is approximate.

The achievements of modern medicine allow a woman not only to live a full sexual life without fear of unwanted pregnancy, but also to calculate the time most favorable for conceiving a child.

How to make a conception calendar

Conception is the process of fusion of an egg and a sperm; it is from this moment that a new life appears and begins to develop. It is impossible to accurately calculate when this great sacrament takes place, but it is possible to determine from a woman’s menstrual cycle the time when this is most likely to happen.

The egg in the female body matures towards the middle of the menstrual cycle. When the egg is mature and ready for fertilization, it is carried into the fallopian tube. This moment is called ovulation.

In order for a person to conceive, sexual intercourse must take place at the earliest - 4 days before ovulation, and at the latest - a day after it. This condition is due to the fact that after sexual intercourse, those sperm that managed to reach the fallopian tube can wait no more than 4 days for the egg to appear there, and then they die. An unfertilized egg can live for 24-72 hours. Therefore, for a planned conception, it is important for a woman to draw up a special calendar and know the most favorable days for sexual intercourse.

To compile such a calendar, a woman must calculate the duration of her menstrual cycle, since the day of ovulation falls approximately in its middle, and best days to conceive are five days: 3 days before ovulation and 2 days immediately after it. Many calendars calculate 4 days before ovulation and 4 after, since the process of releasing the egg can vary in the time interval between three days. Thus it is possible.

You need to count from the first day of your period (that is, inclusive, the days of menstruation). The length of the cycle may vary, so you will have to monitor it for several months, but even in this case, it is quite difficult to calculate the exact period of ovulation.

Therefore, when calculating the time of ovulation, additional methods are used. The most accurate of them is an ultrasound scan during expected ovulation, but this method is not very convenient, since several procedures may be required during each intermenstrual period.

A slightly less accurate, but much more convenient method is an ovulation test, which is sold at the pharmacy.
And the third way is to measure basal temperature (rectal). In order for this method to work, the temperature must be measured in the morning, without getting out of bed, and recorded over several cycles. This method requires patience and discipline, but the accuracy of the results will still be relative.

Thus, the most optimal method for drawing up a conception calendar is the following: calculate your cycle, and then, within 1-2 periods, use an ovulation test to determine the day on which it occurs. If your cycle is stable enough, then after 3-4 periods you will receive an individual and fairly accurate conception calendar.

Calculate favorable days for conception

If you have already compiled a calendar for your menstrual cycle, then you can begin to calculate days favorable for conception. For the most accurate calculation, you will need to have a calendar for at least 3-4 months.

Now calculate the day on which you ovulate. As a rule, with a twenty-eight-day cycle, the release of the egg occurs approximately on the 14th day. In a short cycle of 26 days, ovulation occurs on the 12th day, and in a long cycle (30 days) - on the 16th day. Possible deviation is 3 days. Therefore, to accurately determine the day of egg release, you need to start doing tests approximately 4 days before the expected date.

If the result is negative, continue testing daily until the result is positive. Once it is received, mark the day of ovulation on your calendar. During the next month, begin intimate relations with your partner with the goal of conceiving approximately 4 days before the calculated date of ovulation, sexual intercourse is also desirable on the day the egg is released and within 2 days after it. This recommendation is based on the lifespan of the sperm and egg.

Keep in mind that pregnancy may not occur even with careful calculation of days favorable for conception, since a healthy woman of reproductive age has cycles when the egg does not release from the ovary. In this case, the attempt should be repeated on favorable days of the next period and during sexual intercourse, positions most suitable for fertilization should be used.

Calculate the day when conception occurred if pregnancy has already occurred

Is it possible to calculate the exact day of conception of a child in the case when pregnancy has already occurred? If you are in the habit of keeping a menstrual calendar, then this will not be difficult to do. You just need to find out the date of the first day of the last menstrual cycle.

About halfway through your cycle, you ovulated. Now all you have to do is remember whether you had intimacy with your partner 4 days before ovulation on the day of ovulation or 2 days after it - and you will know the day your child was conceived.

It will be more difficult to determine the day of conception if you do not keep a calendar and cannot remember the date of the start of the last menstrual cycle before pregnancy. In this case, we can advise you to buy a pregnancy test, which shows not only the presence of pregnancy, but also its duration. To be more confident, also undergo an ultrasound scan, compare the test results with the ultrasound results, and calculate the date of conception.

There is an obstetric pregnancy period and an embryonic period. Obstetricians calculate the date from the last menstrual period. Embryonic, that is, the actual period of pregnancy, from the day of conception. Therefore, the difference may be about 2 weeks. The obstetric period is longer than the actual one - embryonic, because during the first day of menstruation, the birth of a new life is unlikely to occur.

Keeping this calendar allows you to determine the best period for conceiving a child. The accuracy of this method is directly proportional to the stability of the menstrual cycle. Experts believe that the most favorable time for conception is the moment when the egg matures, and five days before and after this moment.

The maturation of the egg occurs in the middle of the menstrual cycle. But, even if menstruation is regular, the ovulation period may shift slightly. If the cycle is 28 days, ovulation should occur on the 14th – 15th day. The maximum chance of conception occurs from 9 to 20 days. These days are considered the most favorable period.

Basal temperature

Measuring basal temperature will also allow you to determine the time of ovulation, and therefore which day will be the most favorable for conception. This method is suitable for women who have a stable menstrual cycle for at least six months. It is necessary to number each day of the menstrual cycle in a notebook and determine the moment of ovulation - the middle of the cycle.

It is necessary to measure the temperature in the rectum daily. During the first phase, the basal temperature is slightly lower. When the moment of ovulation occurs, the hormone progesterone begins to be intensively produced, which leads to an increase in temperature by half a degree.

The highest temperature is characteristic precisely at the moment best suited for conceiving a child, namely, the day of ovulation. When the temperature begins to drop slightly, this means that days have arrived that are not very suitable for conception. Temperature measurements must be taken at the same time. Early morning is best for this.

Methods to help calculate days for conception

After menstruation ends, the level of estrogen in the female body increases. This is manifested by an increase in the content of chlorides in saliva 2–3 days before the onset of ovulation. When dry, saliva becomes highly crystallized. These changes are used to identify a favorable period for conceiving a child.

You can determine which day is most favorable for pregnancy by purchasing special tests at the pharmacy. They have two indicators in the form of thin strips that change color when in contact with urine or saliva and accurately indicate which days are most favorable to conceive a child.

The action of such tests is based on measuring the level of luteinizing hormone, a quantitative increase in which leads to ovulation of the egg. The best result in determining a favorable day for conception is achieved by a combination of techniques.

The birth of a new life has been considered a sacrament since ancient times. Some still decide that it is not worth interfering in the affairs of God, while others are trying to determine the day of conception, since there may be various reasons for this.

The simplest and oldest method of determining the day a child is conceived is the method. To do this, it is enough to know the exact number of days in the menstrual cycle and subtract the duration of the luteal phase from this figure. This is the period when ovulation occurs, the meeting of the sperm with the egg, its implantation into the walls of the uterus and further development. In 90% of cases it lasts 14 days.

For example, consider a cycle that consists of 29 days: 29 – 14 = 15. So, ovulation occurred on the 15th day of the menstrual cycle. This means that fertilization occurred on that day or the next, because A female egg lives no more than 48 hours. To the question whether it is possible to determine the day of conception using this method, for girls whose menstruation is irregular, the answer will be negative, because It is not possible to find out the exact number of days in the cycle when conception occurred.

Is it possible to determine the day of conception using an ultrasound scan? This is one of the difficult questions. Ultrasound examination is more aimed at studying the development of the fetus at the appropriate time. The doctor will examine the baby and, based on the information received and the date of the last menstruation, will diagnose pregnancy. In order to calculate the date of expected ovulation, and therefore conception, based on these data, it is enough to subtract two weeks from it.

So, it is possible to determine the exact date of conception, but it should be remembered that there is almost always an error and, as a rule, it ranges from 2-3 days to a week. The ultrasound method is also not 100% reliable, although the opinion of a specialist in this field may play a certain role in confirming the date calculated by the calendar method.

Ovulation and conception calendar is a universal and fairly easy-to-use service designed to calculate the menstrual cycle and the most favorable period conceiving a child. Its main task is to help a woman determine the days of increased fertility ( ovulation), during which conceiving a child most likely. At the same time, thanks to the calculation of the so-called “safe days”, ovulation calendar allows her to avoid unwanted pregnancy without the use of any medications or mechanical contraceptives. In order to take advantage ovulation calendar and calculate your own menstrual cycle (favorable period conceiving a child), fill in all the fields of the form below one by one. Registered and authorized users of our Internet portal can save their personal ovulation and conception calendar in the “favorites” section of your personal account and return to it later.

Ovulation calendar and the most favorable days for conceiving a child

Ovulation- this is the process during which an egg that is mature and completely ready for upcoming fertilization leaves the ovary, enters the abdominal cavity and is then sent into the lumen of the fallopian tube. It was during this period that the likelihood conceiving a child maximum and is estimated at approximately 33%, which, of course, should be taken into account when calculating ovulation calendar and a woman’s planning for an upcoming pregnancy. After ovulation the egg is capable of fertilization ( conception) for 12-24 hours, while sperm after ejaculation remain active for 2-3 (and much less often 5-7) days. Considering this fact, the possibility of a woman becoming pregnant the day before ovulation is approximately 31%, two days before - 27%, and three and four days before ovulation- 16 and 14% respectively. In the same time conceiving a child six days before ovulation or the day after it is unlikely and even practically impossible. Usually ovulation occurs between the 14th and 16th days of the menstrual cycle under the influence of estrogens and pituitary hormones.

Ovulation calendar and sign of conception

One of the most reliable and important signs of the onset ovulation and favorable period for conceiving a child are changes in a woman's cervical mucus. First of all, under the influence of estrogens, the amount of secretions increases and their viscosity decreases. The next, no less important, sign of egg maturation should be considered a decrease in rectal (basal) temperature during ovulation and raising it the next day. At the same time, in order to more accurately calculate ovulation and conception calendar, it is recommended to take your temperature every morning at the same time for several months. Sometimes at the moment ovulation a woman feels pain in the lower abdomen, the nature of which can vary quite widely from weak and short-term to strong and very long-lasting. It should also be noted that on days ovulation Some women experience a peak in sexual arousal.

Ovulation and conception calendar is a diagram of the menstrual cycle, which marks the time of its beginning, end, as well as the ovulation. Full management calendar involves mandatory recording of periods of active sexual activity. Compilation ovulation and conception calendar it is necessary to start long before planning pregnancy in order to learn how to determine the moment as accurately as possible ovulation and become familiar with all the features of your own body.

Ovulation calendar and conceiving a child

Depending on the probability conceiving a child and time ovulation menstrual cycle ( conception calendar) can be conditionally divided into three phases: relative sterility, fertility and absolute sterility. The period of relative sterility begins with the appearance of bloody discharge and ends ovulation. During this phase, some difficulties with contraception may arise, since its duration sometimes varies within several days, even with a stable duration of the cycle as a whole. This happens due to the fact that periodically, depending on certain factors (external and internal), ovulation comes a little earlier or vice versa later.

The fertile phase begins from the moment ovulation and ends after 48 hours. At this time the probability conceiving a child as high as possible. As noted above, after leaving the ovary, the egg is capable of fertilization within 12-24 hours, the remaining half of the time is allocated to inaccuracy in timing ovulation. Following the period of increased fertility, the woman enters a phase of absolute sterility, during which conceive a child almost impossible. This period lasts until the end of the menstrual cycle and is about 10-16 days.

Ovulation calendar and calculation of the period of conception of a child

Most modern women expect ovulation and conception calendar in order to bring the long-awaited motherhood closer. Others are building calendar to protect yourself from unplanned pregnancy. However, no matter what goals they pursue, when calculating the menstrual cycle (and ovulation calendar in particular) in any way there is always a possibility of error.

According to the calendar calculation method ovulation a woman should record the start and end days of her menstrual cycles for at least six months. In order to determine your individual fertile period based on these data ( ovulation and conception calendar), it is necessary to subtract 11 from the number of days of the longest cycle (the last fertile day of the cycle), and 18 from the number of days of the shortest cycle (the first fertile day). So, for example, the longest cycle for a woman is 32 days: 32-11=21 (the 21st day of the cycle is the last in the fertile phase). Her shortest cycle is 26 days: 26-18=8 (the 8th day is the first in the fertile phase). In this case, the most favorable period for conceiving a child is the interval from the 8th to the 21st day of the cycle (13 days in total).

One of the best and more accurate methods of calculation ovulation and conception calendar child is a combination of the above methods, which is called the symptothermal method. It includes measuring basal body temperature, daily monitoring of cervical mucus and accurate calculation ovulation calendar and favorable period for conceiving a child calendar method.

Action of tests for calculation ovulation calendar based on the same principle as for diagnosing pregnancy. When interacting with a woman’s urine, two transverse lines appear on it, one of which indicates the normal performance of the test, and the second indicates an increase in the level of luteinizing hormone (LH) and the woman’s full readiness for conceiving a child. However, if the second line remains paler than the control line for several cycles in a row, this may indicate the absence of ovulation due to any disease (thyroid disease and hyperprolactinemia, obesity and exhaustion, polycystic ovary syndrome and infantilism, increased FSH levels and decreased estradiol levels, chronic stress, etc.) and is a reason to consult a doctor.