So my boyfriend and I had sex when he was in town last weekend and I had a three percent chance of getting pregnant. We had sex with a condom, but also used the pull out method a few times. I haven't had any normal signs of my period but my boobs are swollen. I think I was supposed to start yesterday but sometimes my periods are weird. I don't know, I'm just worried. I'm only 18. I think I just needed to vent. I'm waiting to take a pregnancy test though. To see if it does happen in the next few days.