Thanks for the query.
Usually after 34 weeks the possibility of the change in position of the baby decreases as the size of the baby increases and the amount of liquor decreases.
So as your doctor told there is less possibility of vaginal delivery
Because usually cesarean section is preferred in case of primi with breech presentation
and sometimes in multies also.
You didn't mention what injections your doctor prescribed. Anyhow follow her advice and go for repeat scan.