If you have a 3 day cycle and had sex the day before ovulation but conceived on ovulation day is there any chance that the second guy 3-4 days later could be the father of the unborn child(had sex with him on the 15th)?? April 28 first day of my last cycle and from the 6-12 fertile days but the 11th was ovulation day which was the day I basically had sex on since it was no longer Mother's Day after 12am which is another day!! Help Please!!!!