First day: Due to the variation in length, they are asking about the first day of your last menstrual period, this tells them the approximate time of ovulation.
Answered 5/31/2013
5.1k views
First day it started: Normal cycles occur from 21 to 35 days apart, lasting 2 to 7 days.
Answered 5/31/2013
5.1k views
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