I currently am pregnant 33 weeks. I had a period August 20, 2010-August 24, 2010. I had intercourse on August 24th, 25th, and 27th with someone. My periods are irregular because of my birth control. Then I had sex again with someone on September 3, 2010 but didn't know I was pregnant. So is the first person my baby's father or the second person?

The dates are close enough that it really could be either one depending on when you happen to ovulate. You will need to have a DNA test done after baby is born to know for certain.