am I pregnant?

Blair
My boyfriend and I made a drunken mistake last weekend and didn't use any form of protection. The app said I was ovulating that week as well... oops! I didn't really worry about it because I have pcos, so my cycle is almost always off anyway. We had sex last night and I noticed I was bleeding after. I have since stopped bleeding. The blood was darker and  im not expecting my period for another week. What do you guys think? Could I be pregnant, or is this just pre period spotting?