Birth control

Kelsey
So i am 17 turning 18 next month. I used to be on the pill just because my periods are so irregular. Me and my boyfriend have been together over two years and have sex alot. But my mother is very strick. Im afraid if i ask her to be on the pill again shell think im having sex when i tell her im not. The last time she found out i had sex she didnt let me see my boyfriend for three months and wouldnt talk to me. What do you guys think. Should I just wait till im 18 next month or ask her to  be on the pill again. And whats your guys choice for the pill. Or do you prefer the depo shot.