Birth Control Advice!

Um ..I Am 15 Years Old And I Know What You're Saying I Am Too Young To Engage In Sexual Activities But Hey Things Happen. So I Started Birth Control On (Dec1) I Was On The Nuva Ring , And It Wasn't Wasn't For Me I Hated The Way It Moved Around My Vajay When I Sat Down Or Layed Down And Having To Occasionally Push It Back Up So I Tried The Pills Next (Ortho-Novum 777) Not Aware Of How It Would Mess Up My Body ! It Was All Okay When I Started Until I Got To Day 5 I Started Bleeding Out Of Nowhere And Cramping So Bad Also Vaginal Pain Its Been Going On For 6 Days Now My Provider Prescribed Me New Pills On Dec 14 (Apri) Because Maybe Those Other Pills Weren't What My Body Could Adapt Too . And Only Took One Pill Out Of The New Prescribed Pills And Stopped 2 Days Ago And I Am Still Bleeding , IVE ONLY BEEN TAKING THE PILLS FOR 8 DAYS !!!!! I Don't Know What To Do And How Long It'll Take My Body To Regulate I Am Never Taking Birth Control Again , But Any Advice?!