Okay so on November 15 I had sex with my boyfriend but the condom broke.. we then went straight after and bought the pill. It was maybe an hour after sex and I took it. I normally have my period around the 21st or the 22nd. It is now the 24th and still no period.. I have had diarrhea, headaches, cramps, which I have never got before and a brown discharge.. we also have had PROTECTED sex on the 20th.. is there a possibility I could be pregnant???