Bleeding

HELP😢Hi, I'm 18 years old, I've been on the pill since October. When I had my miscarriage. Well. After it, I wasn't on my period when I started the pill nor was I due. 3 months later, I missed one pill. Had sex the night before, I have now been bleeding, quiet heavy, and red for the past 2/ maybe 3 days, the day of unprotected sex ovulation was in 5 days. Someone help, I do not want to get pregnant.....