If the mother knows the exact day of conceived, then they can use that ideology to find out when will be the baby is due. Calculate ahead 38 weeks from the day of getting pregnant. That day will be the due date.
This method is only correct if the mother id sure about the date they got pregnant. For accurate day the mother must know the day when she ovulated. Ovulation occurs when the ovaries release an egg. Every woman ovulates about 14 days after the getting of period 1st day.
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