How to calculate pregnancy?

Pregnancy is generally calculated from the last menstrual period 1 day, totaling 280 days, 10 pregnancy month (40 weeks), but the specific time may be shortened or extended 1 2 weeks due to personal physique and other factors.

Calculation of estimated delivery date

For pregnant women with regular menstruation and a cycle of 28 days, the expected date of delivery is usually calculated from the first day of the last menstruation, and the month is reduced by 3 or 9, and the days are increased by 7; If it is the lunar calendar, the month is still minus 3 or plus 9, and the number of days is plus 14.

prenatal examination

Generally speaking, the first prenatal examination will determine the gestational age and calculate the expected date of delivery. If you can't remember the specific date of the last menstruation or the irregular menstrual cycle, you can also calculate the expected date of delivery according to the results of early pregnancy reaction, the start time of fetal movement, gynecological examination, B-ultrasound, etc., among which B-ultrasound in early pregnancy is more valuable for calculating the expected date of delivery.

Actual delivery date

The actual delivery date may be affected by personal physique and other factors, and the expected date of delivery may be different by 1.2 weeks.