I NEED EVERYONES HELP

So two weeks ago my boyfriend and I had sex. We were birth virgins. We were safe and used a condom but he was taking it out and it slipped off. We stopped immediately, and he DID NOT cum. It's now been two weeks. I was supposed to have started my period today and didn't. I've cramped all week, and this morning I peed and had brown discharge. I have been stressing so that may be a reason I haven't started. I need everyone help please. I am 15. I can't have a kid.