birth control help

Kyla
Me and my boyfriend had unprotected sex on Wednesday the 4th. It was kind of rough and I noticed a little bleeding right after. But now by the 6th the bleeding isn't like spotting anymore it's almost as heavy as a period. I've been on birth control for almost 3 months and I should get my period a week from now. Is this bleeding from the birth control? Is it a sign I should try a different brand of birth control? The doctor put me on this brand to start because it's a low dose so, could the dose not be strong enough anymore? Or is it even possible I'm bleeding this much from the sex? Pls help