I think i was raped not sure what to do?

It was my best friends 21st, 2 months ago and we all went to a hotel/casino to drink and gamble. There were 6 of us, and we all got really drunk. I was flirting with the bartender trying to get free drinks. The next day, I woke up outside our hotel door at the time, I thought nothing of it I just assumed it was a crazy night but I feel really weird and disoriented not like after drinking. Anyway I haven't had my period since 2 weeks before that, I just assumed that it was stressed but my friend made me take a preg test yesterday and it came back positive. I think I was drugged and raped because before that I haven't had sex in 6 months. I'm not really sure what to do?