How to calculate the date of pregnancy?

The date of pregnancy is counted from the first day of the last menstruation of the pregnant woman.

1, calculation method of last menstruation:

The pregnancy time is calculated from the first day of the last menstruation, and the whole pregnancy time is 280 days, that is, 40 weeks.

2、? Basic temperature measurement:

If women have sex after ovulation and get pregnant successfully, the basal body temperature will appear high temperature period, usually about 16 days. During this period, the basal body temperature will be measured continuously, and it is basically possible to determine whether she is pregnant.

3、? B-ultrasound examination method:

B-ultrasound can accurately measure the gestational sac size, and calculate the gestational age and expected date of delivery according to the gestational sac diameter.