The gestation period, i.e. the pregnancy cycle, generally refers to 10 months, and the projected due date of some pregnant women will be different from the actual due date. Pregnant women are advised to take more rest, undergo regular checkups and pay attention to their nutritional intake. The pregnancy cycle refers to the time from the first day of the last menstrual period to delivery, which is generally 280 days, or 10 months. As the length of the menstrual cycle varies from one pregnant woman to another, this may result in a 1~2 week difference between the estimated due date based on the last menstrual period and the actual due date. Pregnant women should get enough sleep, not stay up too late, and avoid heavy labor. In addition, after pregnancy, you should go to the hospital regularly for maternity checkups, which can determine the physical condition of the pregnant woman and the development of the fetus. In addition, during pregnancy, you should eat more milk, eggs, lean meat, apples, bananas, green vegetables and other nutritious food. The pregnancy cycle is usually 10 months, and pregnant women should avoid having sexual relations during the third and second trimester. In addition, you should not smoke or drink alcohol during pregnancy, and you should not be exposed to ionizing radiation for a long time.