Vbac after 3 c-sections?

Hi ladies I have six children the first three were vaginal deliveries and then I had 3 C-sections my first C-section was due to the placenta tearing away and myself in the baby start to bleed stuff after the first one they decided the next two would be C-sections just to prevent it from happening again now I'm pregnant with my seventh and final child and would love to have a vaginal birth I was wondering if I have a say so if I can refuse to have a C-section and try to have a bad time delivering I know I can do it if my doctor would just give me a chance