you won't be able to avoid c-sect if baby is breeched that's for sure. try walking up the stairs more (within your physical capability). you can also try rubbing your tummy gently to stimulate baby to switch position if you know your baby's current position
I think your doc is scaring you for no good reason. By 28weeks my doc told me still don’t need to worry have time to change. She say she will only be worried if still breach by 33-34 weeks
Mommy, do walk more. Walking helps to bring baby head down.