Alright, well one thing is that they are most probably going to give you a pap-smear; which like I said is not as scary as everyone makes it out to be! The doctor I had joked with me, and said "i'm not going to bother to tell you to relax, because I know it's impossible." it doesn't take very long at all :)
they may also give you a pee test for pregnancy, otherwise they shouldn't give you any pills until they know. I'm just guessing, because like I said, I went to planned parenthood. I bet the procedure is mostly the same anywhere you go!
You may have to fill out a bunch of forms while you're waiting, just general information. It depends on if they have your medical records or not; but I know at planned parenthood there was a whole sexual survey I had to do (which was a little uncomfortable with my mom there; since she didn't know I was already having sex!!). I had to hide my answers like during an exam!!
You may even get a heated speculum (which is what they place inside of the vagina to hold it open so the doctor can see all the way up inside lol. That's nice, because then it isn't cold! :p