Irregular dark bleeding

i recently had surgery to remove my tonsils, and i got behind two days in my birth control. i started up again, but me and my boyfriend continued to have sex after the missed pills without condoms. three days after the first unprotected intercourse, i noticed light bleeding. the next day, it has turned dark and fairly heavy. i had my normal period about two weeks ago. could the bleeding have something to do with the medecation from the surgery or am i pregnant?? thanks!

Let me know if you get an answer... same think happened to me. Started out light then next day got really dark and heavy. Now Im just bleeding lightly.

Help.

Ok last month around the 10th i would say me and my bf had been having sex almost all month with no protection and it came to like the 26th and i still hadnt had my period and 2 days later i started but it was brown and light and the 29 and 30th it got a little heavier but not alot and today its like gone almost but its like the 2nd of this month and thats never happened to me before usually mine are like week long and heavier and dont last into the next month.the only thing ive had to wear was panty liners and not a pad like i normally wear cause usually i bleed heavy. so im looking for answers before i decide anything.plzz help.