Help!!!

I've been on the pill since march and i've recently had a pregnancy scare: so i went off the pill with out consulting a doctor or at the right time and the saturday before last was when my last period stop it only went for 3 days which is a little unusual And since going off the pill its been 4 days and i've been bleeding heavy since yeaterday morning. I had sex with my partner yesterday morning and after that is when the bleeding started. Its not a rip or a tear and i've been having moderate cramps since yeaterday morning and Im very confused. On the up side my cranky moods have dissapered.😂 help mee.