Pregnancy Date Calculator is based on a \"normal\" 28-day menstrual cycle. If the menstrual cycle varies; longer or shorter, then consult a gynecologist. Go for regular ante-natal checks in your pregnancy routine. Therefore, the formula to predict the date of birth of a child is based on the first day of your last menstrual period (LMP) as well as the length of menstrual cycle.
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Pregnancy Date Calculator is based on a \"normal\" 28-day menstrual cycle. If the menstrual cycle varies; longer or shorter, then consult a gynecologist. Go for regular ante-natal checks in your pregnancy routine. Therefore, the formula to predict the date of birth of a child is based on the first day of your last menstrual period (LMP) as well as the length of menstrual cycle.