[Coffee.]

I'm glad you talked to your best friend! Reporting it in the end is your decision, but I would also suggest you do it. This may be something that he has done before, and will do again.
As many have told you, you were raped. If you were under the influence, he had no right to do anything to you, you did not have the ability to give consent.
I would report it (your decision, however), then think about the pregnancy issue. With the amount of hours, you still have time to get a Plan B pill. I believe they can work for 72 hours afterwards. If you don't do that, I would wait a few weeks and take a pregnancy test, and then look at your options then.
Last, but more importantly, see a professional. This is not something you should suffer with alone.
PM me if you ever need!