Little freaked out.

So me and SO had sex the other night and I started bleeding like really really badly.... And ever since then I've been bleeding. It is not time for my period or have I had signs for my period I was fine no spotting nothing until I had sex with him then I started bleeding like a lot blood. And it's not painful but sometimes I get craps in my ribs. What do u think I should do call my doctor and make sure everything ok?