My boyfriend and I had unprotected sex one night, and he pulled out about a mintue before ejaculation. The next day I got my period. I am irregular and have been fore years, but the past two months had been the first week of said month. Now one month later, at the expected time of my last two, I don't have my period. I'm really scared and worried, and I would like to know the chances of me being pregnant. I've had no "symptoms" of pregnancy other than headaches, which I generally have, and a ridged abdomen. I'd really appreciate some advice,any thanks.