If your last period was in March, your due date is usually around December, and it is normal to give birth two weeks before or after your due date. The gestation period is counted from the first day of your last menstrual period, which is about 280 days (40 weeks). If your last menstrual period was in March, your due date is usually in December. The due date is only a rough projection of the time, not all pregnant women will go into labor on the due date, some will be delayed, some will be early, as long as the delivery occurs in the full term of pregnancy, not more than forty-two weeks of pregnancy, are considered normal delivery. It is recommended that pregnant women pay attention to balanced nutrition, good weight management, and do a good job of pregnancy checkups, so that you can get a general idea of whether your pregnancy is normal or not, and your doctor will also tell you the exact time of your due date.