Baby facing down during pregnancy

When did your baby start facing down during your pregnancy? I heard it's anywhere between weeks 32-37. and How do you know if your baby is finally facing down, ready for delivery? I'm Week 31 and went for my recent checkup and my gynae told me my baby is not facing down yet. If she doesn't face down within 4 weeks, I'll have to go for C-section. But I absolutely don't want to do C-section. Would anyone have an idea of how to figure out if the baby is facing down or how to make the baby face down?