When is the first day of pregnancy?

Pregnancy is a milestone for a woman and a cause for celebration for the entire family. Although many women have become mothers, they actually know very little about pregnancy, and they don’t even know when to start calculating the time of pregnancy. So when does the time calculation for pregnancy begin?

1. General optimization algorithm

During pregnancy, it is necessary to calculate the duration of pregnancy so that the delivery date can be accurately estimated. Generally speaking, pregnancy is counted from the first day of the expected date of delivery. For example, if the due date of pregnancy is April 22, then the first day of pregnancy is April 22, and then add 280 days to get the due date. In fact, the gestational period calculated in this way is only an estimate. The specific delivery time and delivery date are different, usually one or two weeks apart.

2. Other optimization algorithms

In addition to the general optimization algorithm, you can calculate when you are pregnant based on the baby's fetal movement. Generally speaking, the first fetal movement is between 18 and 20 weeks. If it is the first birth, the day of fetal movement plus 20 weeks is the due date. After knowing the due date, you will know from which day the pregnancy began. You can also calculate the time of pregnancy through B-ultrasound examination, because B-ultrasound examination can check the growth and development of the fetus and calculate the gestational age, so that the due date can be calculated, and then you will know when you are pregnant.

The article explains in detail when pregnancy should be calculated. In fact, pregnancy is generally calculated from the due date of pregnancy, that is, the calculation starts from the first day of the due date of pregnancy. If you are a pregnant woman, then you'd better calculate the number of days of pregnancy according to your due date. It's best to learn how to calculate your due date.