Birth control

Jules
So I really want (and feel the need) to go on birth control because I have horrible PMS symptoms and I recently became sexually active; this stress is horrible. However since I am underage I need my mothers permission, so I have brought it up to her before and have gotten a flat out no. It's not that she is against me having sex, it's more that she doesn't want unnatural things messing with my hormones (she is a health fanatic and a cancer paranoid with a lot). Do you guys have any suggestions about how to try to convince her to let me go on the pill???