It won't hurt the baby. Your body will start letting you know when you should no longer do it. I was a tummy sleeper. Now I lay kind of sideways so I'm somewhat on my stomach, but not all the way. If that makes sense.
It happen I just know every time I do it I get yelled at lol but you will get use to it soon just a habit I use to just throw myself on my stomach but it's going to hurt once you do it & idk if it does but my mom told me it hurts the baby