How to determine how many days of pregnancy?

summary

According to the medical regulations, the expected delivery date is calculated from the first day of the last menstruation. The whole pregnancy period is 280 days, 10 months of pregnancy (28 days for each month of pregnancy). Pregnant women give birth within 38-42 weeks of gestation, all of them are full-term. Because each woman's menstrual cycle is different, it is normal that there is a difference of 1-2 weeks between the predicted expected delivery date and the actual expected delivery date. Let's share my experience with you.

How to determine how many days of pregnancy?

Menstruation 3-5 days, even if you are 3 days, the last menstruation date is November 28, 2004. Example: the date of last menstruation is November 28, 2004. The expected delivery date is: November March = August, 28 + 7 = 35, that is, September of the next year; 35-31 = 4. The expected date of delivery is September 4, 2005.

If menstruation is not accurate, it can be calculated according to the time when fetal movement begins. The time of the first fetal movement is about 18-20 weeks, and the expected delivery period may be 20-22 weeks later. According to the ultrasonic measurement of the fetus or the measurement of the height of the uterine fundus, these methods can be used for comprehensive analysis at the end of pregnancy to know when the baby will be born.

Common algorithm: the day that you finally come menstruation begins to calculate! Due date is calculated from the day of the last menstruation, plus nine or minus three, and then plus seven, this is the due date! Fetal movement calculation: if you can't remember the date of the last menstruation, you can calculate it according to the date of fetal movement. Generally, fetal movement begins 18-20 weeks after pregnancy. The calculation method is: primipara is the day of fetal movement plus 20 weeks; Multipara is fetal movement day plus 22 weeks.

matters needing attention

Progestin and vomiting calculation: the reaction of progestin and vomiting generally occurs at the end of the sixth week of pregnancy, which is 42 days after the last menstruation. From this, it is calculated backward to 280 days, which is the expected delivery period. B-ultrasound calculation: when doctors do B-ultrasound, they can estimate the gestational age and calculate the expected date of delivery by measuring the diameter between the two heads, the length of the head and hip and the length of the femur.