Could I be pregnant? Had unprotected sex two weeks ago. I'm on birth control but was also taking an antibiotic at the time which could have affected the birth control. He did not come inside me but there could have been pre ***. I got my period on the 12th (it's now the 15th) and it was very heavy for the first two days, now it is very light and almost gone. My cycle usually lasts for 6 days, so this is very unusual. There was clots, blood was red, and filled several feminine products. I have little to no pregnancy symptoms. Could this be implantation spotting, not a period? Also I know some pregnant women get their period while pregnant.. I am very confused and scared. I cannot have a baby, I am too young with strict parents. Someone please help.