I'm not sure what I should do, but I think I was drugged
Wow, really? What makes you think you got drugged?
It's a bit fuzzy but I remember what happened. I was with this girl, she gave me some kind of drink, then she tried to "rape" me if that's the correct term for it.
Holy crap man, I mean if you didn't want it then it was definitely rape and on top of that if she drugged you then it was rape regardless. If you feel like she violated you should contact the police. It's good to hold people like that accountable for their actions.
That was my girlfriend, doesn't that make it consensual?
It's not consensual if she drugged you to make it happen. You don't really want a girlfriend that would treat you like that do you? You should really consider reporting this to the police.