When is the first day of pregnancy counted?

Calculating the pregnancy time can help us calculate the due date as soon as possible, do a good job of health care and physical examinations during pregnancy, but when should the pregnancy time start to be calculated? This question must be a topic that many pregnant women want to know. Is the first day of pregnancy the first day of the due date or the last day of the pregnancy? Or the day of sexual intercourse? When does the first day of pregnancy begin?

When is the first day of pregnancy counted?

It is indeed difficult to calculate the duration of pregnancy, because the duration of pregnancy is calculated based on the woman's menstrual cycle and ovulation period. For women with normal menstrual cycles and normal ovulation periods, the calculation is usually based on the first day of the expected date of delivery. If calculated from the date of pregnancy, the number of weeks of pregnancy may be about half a month less than our calculation.

Although the estimated time of pregnancy is indeed the day when you actually start to get pregnant, most people will not start calculating the gestational age from that day, because you have no way to know exactly when you ovulated and became pregnant. Therefore, most doctors will choose a simpler method to calculate your gestational age - starting from the first day of your last menstrual period. I believe you won't make a mistake during this period.

How to calculate pregnancy time

Because every pregnant woman cannot accurately determine the time of pregnancy, medicine requires that the expected date of delivery be calculated from the first day of the pregnancy. The entire pregnancy period is 280 days, or 10 months (each month is 28 days). Pregnant women give birth between 38 and 42 weeks of pregnancy, all of which are full-term. Because each woman's menstrual cycle is different in length, it is normal for the estimated due date to differ from the actual due date by 1-2 weeks. The key calculation methods are as follows:

1. Calculate based on the expected date of delivery.

2. Calculate based on the baby's fetal movement date.

3. Calculate based on the ovulation temperature curve.

4. Check and calculate based on B-ultrasound examination.

5. Calculate from the time when morning sickness begins.