I recently went on a trip to europe and I met a guy from another country at a bar hop my friend and I did. I hadn't eaten anything all day and I ended up getting pretty drunk. Anyway, the guy and I ended up having sex. I was a virgin and also I was on the last day of my period. He used a condom. He tried to have sex again with me later and I told him not without a condom (which he claims he didn't have). He was in proximity to me down there and all I had on was underwear and he was dry humping me (but I don't think anything happened). I told him to stop and he did and just rolled over. The next day, I felt aweful about the whole thing. For the next week I felt like I was leaking down there. It worried me that maybe something happened and I didn't really feel it. Anyway, its been almost two weeks and I'm completely paranoid I'm pregnant (on top of feeling taken advantage of). I've been having back pain for the last 4 days but only when I sit down. Usually when I'm about to get my period I have back "cramps"/pain in the same area. I don't feel pregnant but I'm not supposed to get my period for another two weeks. This whole thing is killing me. I don't know if I'm just extremely paranoid (I keep googling early symptoms of pregnancy which probably doesn't help). What do you think my chances are of actually being pregnant?

While pregnancy is not impossible, odds are quite low since you were on the last day of your period, used a condom, and there was no penetration the second time.

Wait and see what happens when your period is due... try your best not to worry, not easy I know, as that can sometimes be enough to through things off for some women.