Ok so this is going to be TMI, apologizes in advance. My boyfriend and I had protected sex early November. Since then I've had two normal periods (heavy flow, horrible cramps the works). But as of now my period is 15 days late! I've taken three AHPT all have come back negative. I know stress can throw off your cycle, and with a new job I've been pretty darn stressed,and I know there's probably a very slim chance I'm pregnant. But what's going on? My period used to be super irregular but the past year it's been fairly regular.