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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.
Doctors use various methods to determine gestational age of a pregnancy. The most common test is the ultrasound, which measures the size of the gestational sac and the length between crown and rump to determine the age of the fetus in weeks. Last Menstrual Period: Using the first day of your last menstrual cycle, gestational age can be determined (plus or minus 2 weeks.) The doctor adds 280 days to the first day of your last menstrual cycle to determine a due date.