Okay so I had sex April 15, and I'm on birth control and he used a condom, but I've been spotting lately and a little crampy, it could be that I accidentally missed a day of birth control and doubled up, which messes with my hormones, also my period is due in a few days but I just started having sex and I'm freaking out, could I possibly be pregnant? What are the chances? Or is this just normal with birth control?