Discussing birth plan with OB?

K.
At what point did you discuss your birth plan with your doctor? Was there ever a point in which you asked what the doctor's beliefs are (in regards to induction, epidural, c-section), or made it clear what you want? I understand drafting a birth plan but is it actually useful? Do you discuss the issue with the hospital ahead of time, does your doctor notate it in your record ..?
My next appointment is Tuesday (33 weeks) and I'd like to know if I should bring it up then or wait.