This is a little embarrassing but I need some answers. On the 24th of July 2013 I had two sexual partners hours apart. After the second partner I started my menstural cycle. I bled for 7 days, then it was my normal partner and myself. Now I was suppose to start my cycle on the 24th of August so I waited. Missed period 7 days took a pregnancy test and its positive. My partner knows about my encounter with another man but now questions the pregnancy. I was wanting to know that is there any possible way it could be the other mans child even though I had a heavy period right after

Although it is a slight chance, yes if there was sex, right before period started, there is a chance.

Your partner is correct in wanting a DNA test after child is born to be sure it is his. This would be my recommendation if he was to write in