Rolling onto stomach to sleep.

My baby will be 4 months on the 19th. He just started rolling nback to tummy. He had only done it in his sleep a few times and would wake himself up crying. But now he’s doing it in his sleep and it’s freaking me out !!! I put him back on his back twice but both times he rolled back onto his tummy he can’t roll tummy to back yet. This makes me soooo nervous. 😰😰😰 I cant sleep at night once I see he’s rolled onto his belly. I know they say it’s ok but it terrifies me!! Does anyone else have a belly sleeper who feels ok leaving them on their belly even tho they can’t roll from tummy to back yet ? I also have the owlet sock on him, and the Newton baby breatheable crib mattress, so my anxieties should be calmed slightly, but they’re not !