Determining the date of birth by the date of conception is the simplest, most accessible and popular method. The essence of the method is to determine the day of ovulation in a woman - the day when the conception most likely occurred. The duration of pregnancy is 10 lunar months - 280 days. Knowing the date of conception, you can easily determine the expected day of childbirth.
Determine the date of the calculation
At the majority of representatives of the fair sex the duration of the menstrual cycle is from 28 to 35 days. Ovulation - the release of the egg from the ovary, falls on the middle of the menstrual cycle. Many women are well aware of the onset of ovulation in their bodies. Often this natural phenomenon is accompanied by such symptoms: increased sexual desire, aching pain in the lower abdomen, brown discharge. If the duration of the menstrual cycle is 28 days, then ovulation occurs approximately 14 days. To determine the date of birth by the date of conception, you should add 280 days to the day of ovulation. Nevertheless, it should be remembered that the female body, due to individual natural features, preserves the opportunity to become pregnant 3-5 days before and after ovulation. This means that the definition of the term of birth by the date of conception may be inaccurate and do not coincide for several days.
The date of ovulation can be determined by ultrasound, like the date of birth. This information is useful for those who are just planning a pregnancy. Knowing the day from your menstrual cycle, when conception is most likely, you can plan your pregnancy and the date of birth. A woman should remember that conception does not always happen on the day of sexual intercourse. Male sperm do not lose their ability to fertilize the egg for 3-5 days in the female body. Therefore, unprotected sex a couple of days before ovulation in most cases leads to pregnancy.
Determination of the date of birth on the day of conception is the most accurate for the fair sex with a menstrual cycle of 28 days. If the cycle is more prolonged, then it is more difficult to calculate the term of childbirth by the date of conception, since the pregnancy in this case lasts for several days longer. In women, pregnant twins, the duration of pregnancy is 1-2 weeks less than with one child.
After 12 weeks of pregnancy, the method of determining the date of birth by ultrasound is less accurate than the date of conception.