Bc and parents

I really want to get onto bc I am sexually active and do not want to risk getting pregnant at all and I would like to get on BC, but issue is my mom will not let me get bc at all( she doesnt know I’m sexually actively) plus I have really bad pms and period symptoms that I would like to get under control. My question is is how can I get on bc without her knowing( I would drive to planned parenthood but she tracks my phone) any advice would be great thanks:)