Pregnant or Late Period

Morgan

I’ve had regular periods my whole life, I’ve always tracked them. I know when I’m supposed to start, end, when I’m ovulating and when I’m not. My boyfriend and I had sex a few weeks ago, unprotected, and now I haven’t had a period. My period was supposed to start on 1/15 and end on 1/20, but never came and I still don’t have one. I have taken pregnancy tests and they have all came out negative so I’m not sure what to do. Please help!!