Tough to tell: Ovulation in a 30 day cycle happens on 30 - 14 = 16, in a 33 day cycle on day 19. If the period started on 8/12, then 1) plus 16 = 8/28, plus 19 = 8/31. since there was no intercourse around these dates, conception must have occurred much later. Without a gestational age determined by ultrasound, either one of them could be the father.
Answered 1/11/2016
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