The pill

Hi sooo I’m 18 I live at home (going to college) and I want to be able to get the pill and have a conversation with my mom about it but I’m not sure how to go about it. She thinks the pill is just for birth control and that’s part of the reason I wanna get it but I also get really bad cramps and back pain which, correct me if I’m wrong, I heard the pill can help with that also. Anyone have a similar experience and has any advice?