Please help!!!

So I'm on birth control let's start off with that. I haven't had my period for 2 months now and I'm kind of scared. Me and my boyfriend use protection every time. There isn't a time where we don't. I don't know if I should go to the doctors. I'm really scared that I could be pregnant but I don't know how. Can someone please help me. I really need it because right now I'm really scared.