How do i get on the pill secretly?

So I'm a minor and my mother would murder me if I asked about getting on the pill. I know our insurance covers it but it would show up on the bill. Furthermore I'm really tight on cash right now so I dont think id be able to pay for it. I dont even know where to start. I'm hoping to shorten and regulate my period but I'm sure my mom wouldn't understand that my reasoning isn't sex. Any advice?