maybe or maybe just paranoid

So I'm on bc pills and have been for a year and a half I'd say and my boyfriend always finishes in me like every time we have sex. I recently have been soooo emotional like I cry over anything and everything and I've been so hungry and crave weird things. I got my period when I was supposed to (2 weeks ago) and it was only for 3-4 days and not heavy at all I could wear a tampon for the whole day and I'd be fine and it was really red! And my boyfriend and I were having sex yesterday and a lot of brown stuff came out of me when we stopped (he hadn't busted in me) it was almost I'd say like cum but a brown tint. Maybe I'm just over thinking it! Could I be pregnant ?! Help