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1. Ask your parents and other people present at your birth. Your parents might remember when you were born, or direct you to other family members or friends who were there when you were born. They may also have a copy of your birth certificate.
How is my due date calculated? Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. If you deliver on your due date, your baby is actually only 38 weeks old, not 40.