Could I be pregnant?

Yes I'm sorry here is another 'am I pregnant?' Post. It's been exactly 2 weeks today since I had unprotected sex and my boyfriend DID come inside of me. I am suppose to get my period in 2 days, on Wednesday. Now ever since I got on birth control (two years) I have always gotten my period on Wednesday's. I always knew EXACTLY when I got my period. I was never late or early. But it's Monday right now and I have really bad cramps and I just looked and there's a bit of blood. But what's coming out in the toilet is brownish reddish and thick. It's all glopped together. Which isn't very normal for me. Like this isn't normal for me at all. Could this be a pregnancy symptom? I've had stomachaches and diarrhea for the past week and a half now. What do y'all think?