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Ask the hospital for records. As a last resort, you can try checking the records department of the hospital in which you were born. Contact the hospital through phone, email, or an in-person visit, and ask to see any records which may have the time of your birth recorded.
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.