Heavy period advice ?

I’ve been on birth control since I was 18 and I’m now 20 because I’m sexually active, but I also thought that the pills would possibly help out with cramps and heavy flows. I haven’t had that experience yet and I’ve been on a couple different kinds. I’m on Marlissa now which is like a higher dosage, but I still don’t see a difference. I know that everyone has different bodies and all, but I find it kind of strange that I haven’t seen any real difference with me. Cramps are the same and flow is the same. So my question I guess is that do you guys have any recommendations that I could do to help this? My flow is seriously just so heavy that I need to always change my pad/tampon. Btw, I just went to my gynecologist recently and she said it was normal.