36+3, baby boy measuring around 6lbs 6oz, constantly flipping around in my belly!

My big baby boy keeps flipping around and it’s stressing me out! Baby was frank breech from week 27-33, turned head down from 33-36, and is now breech again. Dr said he’s measuring on the bigger side but still has plenty of room to flip. He’s an active baby and I feel him move around A LOT, some days I’ll feel hiccups low in my pubic area and other days high up towards my ribs.... Why does he keep turning? I’m worried that I’ll have to have a c-section 😔. Any other moms experience this at this stage of your pregnancy?