Technically, ur completely fine! I use to wake up on my back & panic & feel sooo bad but your body will actually make you roll over if you were harming the baby or if the baby wasn't getting oxygen. I talked to my doctor about it & she explained that to me, so I feel so much better about it! & trust me, once you get bigger, laying on ur back won't even be an option bc I literally can't breathe if I do! Lol