Pregnancy lasts a total of 280 days, counting from the first day of your last menstrual period. Pregnancy is generally expressed in terms of weeks of gestation, usually 40 weeks as the estimated due date. The start time is counted from the first day of the last menstrual period. The pregnancy cycle refers to the period between conception and delivery, which is 280 days in total. Since every woman’s menstrual cycle is different, there are longer and shorter periods. The expected date of labor also varies somewhat, and it is usually normal for it to be 1 to 2 weeks earlier or later. In addition, in addition to projecting the date, you can also clarify the duration of pregnancy based on ultrasound test, according to the development of all aspects of the fetus, the size of the fetus and so on. During pregnancy, it is important to be strictly on time for maternity checkups and to observe the development of the fetus in all aspects at all times.