I've been on the pill for over a year, I had unprotected sex five days ago and he cam inside. I got my period/breakthrough spotting randomly yesterday, about a week and a half early. I have been stressing about some things and around that time wasn't taking my pill right at the same time for a couple days, I am worried I could possibly had gotten an STD? Or could this be a sign of pregnancy even though I am on the pill? Help please.