Having learned about pregnancy, the woman thinks about the deadlines. The gestational age is very important, both for determining the date of childbirth and the state of intrauterine development of the fetus.
Most women add nine months to the estimated date of conception, which is not entirely right.
Orientation for sexual intercourse, does not give an accurate answer. After all, a sperm can be in the fallopian tubes for several days, waiting for the egg and fertilization.
Doctors count pregnancy by obstetric weeks, starting from the moment of the last menstruation. Pregnancy lasts 40 obstetric weeks . (10 obstetric months for 28 days)
– The most accurate way to calculate the deadline is an ultrasound of the early pregnancy. Up to 12 weeks, the embryo develops the same in all women and therefore it can easily determine the age by its size. If you conduct an ultrasound after 12 weeks, then the calculations will be less accurate.
– Visiting a gynecologist about pregnancy, a woman always hears the question of the date of the last menstruation. This is enough to determine the estimated date of childbirth. It is from the last menstruation that the obstetric period of pregnancy begins.
– It is also an equally effective way to determine the deadline for the results of a gynecological inspection. First of all, the gynecologist draws attention to the size and shape of the uterus. The gestational age is set based on its size.
Determination of the date of birth
Nevle’s formula is one of the simplest ways to predict the date of birth than gynecologists actually use.
For calculation, it is required to count from the first day of the last menstruation three months ago and add 7 days.
This method is not very accurate, because the menstrual cycle in women may differ and, accordingly, ovulation can occur a little early or later than the date on which the formula of the Negele is based.
Only 4% of children are born in exactly the appointed day, therefore, considering the appointed or designed period of childbirth as an approximate. Expect the baby plus or minus two weeks before or after this period.