I got off my period the 18th of August and iv been having unprotected sex (I'm not on any birth control .) I had sex while on my period and after. I spotted on the 31st of August and it was just a little bit of light pink stuff when I wiped. I only seen it that one time. Now I'm cramping in my lower stomach like I'm having a period with out the blood and I have been eating more then normal. I v never done this before and I'm worried I could be pregnant! The only thing is , is my boyfriend told me that he can't have kids with out the help of doctors. I'm not 100% sure that he is telling the truth or not. But if so could I be that one in a million girl that he got pregnant?! Please help! Thanks in advance!