It is possible to give birth in nine months or ten months of pregnancy, and the exact time of birth depends on the specific physical condition of the pregnant woman as well as her menstrual cycle, usually two weeks before or two weeks after the expected date of labor is normal. The total number of days of pregnancy is 280 days, 40 weeks and 10 months. Pregnancy is counted from the first day of the last menstrual period to the end of labor and delivery, and is usually counted at forty weeks. The regularity of menstruation is also accurate for the estimation of the expected date of labor, which is also calculated according to the last menstrual period. Generally about 40 weeks of pregnancy, 38 weeks to 42 weeks of labor are normal, the expected date of birth is only the approximate time of birth, may be earlier or later. During pregnancy, you should take good care of all aspects of your body, eat a well-balanced and comprehensive diet, take appropriate physical exercise, and do it regularly. If you feel unwell, you should seek medical advice promptly.