I asked my friends, and they're saying that I didn't. I don't know what to think man.
I just have the faint memory of it, but I'd have guessed that one of them would have some notion of it.
You could still possibly mention it to your girl, saying you don't remember but you wouldn't feel good not saying, if you think it'd bite you in the ass in the future. Right now your only real "evidence" is nothing did happen (would be odd for your friends to lie to you unless you think they're trying to protect you for whatever reason).