I am 18 weeks & 1day my last period was on July 11,2016 and I had sex with two people during ovulation time the first person I had sex with was on July 23 & the other person I had sex was on July 25 I'm tryna figure out when did I conceive & who my child's father is, when I had sex on July 23 he did not cum in me but when I had sex on July 25 he did cum but he pulled out and I know sperm can last up to 5 five days that's why this is so hard to figure out. Im thinking I got pregnant from precum but I just wanna know when did I concieve