You'll need to record the starting date of
your last period and your usual menstrual
cycle duration. Conception occurs during
the fertile days of the cycle. The
fertile days 3 days before and 1 days
after ovulation, which itself occurs about
14 days before the next period starts. If
your cycle lasts 28 days (as in most
women,) ovulation happens about 14 days
after the start of the last period. In
women with a 21 day cycle, ovulation
happens about 7 days after last period
started. If the period (menstrual
bleeding) lasts 6 days, ovulation would
occur 1 day after the period ended. All
these calculations are only orientational
and can’t determine the real father for
sure. A paternity test (dna-test) is the
most secure method for determining the
real father. <br>
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