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.






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