Thanks for all your prompt replies. So the overall answer is that its unlikely, but I'm not 100% ruled out - pretty much what I was thinking beforehand. Always good to get numerous opinions. I guess I have to wait until she is ready to get tested and find out whether or not she is actually pregnant, and go from there.

As for all your concerns regarding STD etc, both this girl and myself have been tested earlier this year so this whole incident was relatively risk free in that regard. Her and this other male have been in an 'on and off' relationship for a while now, and she has told me that she hasn't been sexually involved with anyone else apart from us two. Ofcourse I know this should be taken with a grain of salt, but I do trust her.

This whole thing happened at a party, where alcohol was involved. Stupid I know. But I guess I needed a scare like this to stop anymore of this happening in the future.

Thanks again.