If I have a natural birth in hospital do I have to be on my back?

Bradi • Mama to a baby boy born 1/4/2019! 💙💚👶🏼

Everything i am reading about all natural birth says that you shouldn’t do it on your back. I am giving birth in a hospital with a doctor- are they going to make me be on my back? Is it considered in your back if you’re sitting up? Someone help! Lol