I ran into my ex boyfriend on June 14,2012 and we had sex... he didn't ejaculate in me however. My current boyfriend and I later worked things out and went back together in July. We had sex on July 9,2012 and he ejaculated in me. What are the chances that the baby will be my current boyfriend's and how can I be sure? My period was supposed to come two days ago and I missed it by the way