Birth control for 15 year old questions?

I go to Planned Parenthood, I did not need a parent, but I had one anyone. I got BC when I was 15. They will give you either Trivora ($21) or something else that doesn't work as well for ($12). But when you go in, they tell you right away that it does not make you lose weight or lessen pain. In fact, I started getting cramps for the first time when I got on the pill. It did shorten my period to about three days and I always knew the exact day I would start.