It's possible that you may have been drugged. Please go to your local hospital to be checked and they can test you to see what may have happened. Also, they may give you the morning after pill or if they don't, you may want to look into getting it yourself as a precaution. Hope it all goes well.
Sounds like you were drugged to me - what makes me sick is what kind of a guy would do that to a woman in the first place? I hope you go to the hospital and get it checked out, and then file charges against those guys, they should go to a prison where they can learn what it means to be raped.
if i was yuh i would get checked.
bt maybe yuh just got too drunk?