Menatral peoblems pregnant or cervial infection

Patient: I had an Abortion in June. Started period normal in august and September. During period in September I took a plan b bill and it made my period stop the next day then start again, so I bled for 7 days total with one day break in the middle. Now I am 25 days late on my period 7 Pee tests say negative and one blood test said negative, last test was 3 days ago. Last night and Monday night I started bleeding during sex but not before, not after and it was light colored not like period blood. I have no clue what it going on and I am really freaked out.