Dating your pregnancy from conception


01-Apr-2017 02:21

Your due date is determined by a simple calculation – Add 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28-day cycle).Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy.Use our Pregnancy Calculator to calculate these dates for you.If the mother has a regular period and knows the first day of her last menstrual period, gestational age can be calculated from this date.Knowing how your ovulation date coincided with the potential for conception also may give you a hint as to the sex of the baby you're carrying.Author and physician Landrum Shettles says in his book, (Doubleday), that the father should not have an ejaculation for the three days before the "target date" (a day or two before ovulation) if you're trying for a boy.

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For a woman with a regular period, conception typically occurs about 11-21 days after the first day of the last period.