At first, I probably won't even notice for about 3 seconds from coming back from the dead. Then, cue freaking the hell out for about 15 minutes before trying to figure out the particulars: did the timeline just get altered and I was /always/ female?
If so, then presumably all the details involved in my life would have already been in accordance and don't need to be worried about. I would probably cut class that day (upside to college!) unless there was something immediately pressing like an important test or a class today actually checks attendance, in order to reorient myself and figure out what exactly the past me did, and start getting used to being the opposite gender.
If not, then I'll have a hell of a lot of explaining to do as to why I'm a resident in a male-only college dorm, and probably go through a lot of red tape changing everything and attempting to explain to my friends what just is going on.
In any case, it would cause a lot of extra complication in the short-term, although I guess eventually I'd get used to it, learn a lot, and possibly not want to go back after a certain point if it were possible. I'd still be mostly my same old self, despite the circumstances although my personality would drift slightly over time.
Major tl;dr post! :D