Paternity testing: The only way to know for sure who the father is is with paternity testing.From your dates, your last period should have been 1/20/15 and with a 29 day cycle that would make ovulation approximately 15 days later or 2/4/15 but since there is some normal variation sex on the 31st of Jan or the 4th of Feb could have resulted in conception. The sperm from the 31st could still be around. Hope this helps
Answered 10/31/2017
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