- 1). Determine the date of the first day of your last menstrual period.
Example: January 1, 2011 = date of your last menstrual period - 2). Add seven days to that date.
Example: January 1 + 7 days= January 8 - 3). Subtract three months from that date and adjust the year, if necessary.
Example: January 8 -- 3 months= October 8
Estimated date of delivery (EDD), or due date = October 8, 2011
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