Heavy bleeding between periods

Em
So. My last period was two weeks ago and I've been bleeding really heavily for the past few days. I had a UTI (taken care of) right at the beginning of this weird bleeding... I'm on the pill and have been sexually active.. I know bleeding between periods is normal for people just starting the birth control pill but this is an insane amount of blood (much heavier than my normal period) and it's not going away... Help?