Should my period be this heavy on the pill.

The pill is meant to regulate my period or reduce blood so I’ve read. I am extremely heavy without the pill, and still quite heavy with, I go through two overnight pads during the day within two hours sometimes less with my period still leaking.. my period goes for 5-7 days usually 7 and the whole first 5 days I’m extremely heavy, the next two I’m average bleeding, sometimes light. is anyone else like this. And should I see a doctor about how much blood I’m losing.