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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.
One can calculate the age of the baby from the last menstrual period (LMP) â the result of this calculation will provide the gestational age. Importantly, the exact date of conception is almost impossible to know.Typically, the baby will be due 40 weeks after the first day after your last menstrual period.alculating Time of Conception and Due Date. Our KnowtheGender baby gender test can be performed as early as the 9th week of pregnancy (the person taking the test must be 9 weeks pregnant, with counting commencing from the first day of the last menstrual period).