I am on birth control, I haven't missed any pills and I had unprotected sex on the 26th and i am supposed to have my period the first of every month. But I haven't had my period and this will be day 2. I have cramps but I haven't started bleeding. I usually start spotting two days before my period. So I should have started bleeding on the 26th when I had unprotected sex. I have cramps every now and then but its nothing like when I'm actually on my period. Is there a chance that I could be pregnant?