Hi guys. So basically, around a month ago I ended a relationship with a guy I was dating. We had sex where we would do it without condom and halfway into the act, he would put the condom on and then go fast to . I never had his semen in my vagina, if anything pre . I was wondering how likely it is to have gotten an STD (the ones that worry me are HIV & Hepatitis C). My dad told me if he didn't come inside me, there wasn't a high risk. I read online I need to wait around 12 weeks for accurate HIV & other STD tests readings.