I'm about to be 5 months next week and I still sleep on my stomach! You can sleep that way as long as it's comfortable for you cuz of course once you get big its not comfortable anymore! ;)
Hate you tell you but it's not up to you..the bigger your belly gets you will have no choice, I was about 15 weeks when I had to stop and you just get used to it the other way... you can't sleep on your back while pregnant either do your choice is side to side
I'm the same way total stomach sleeper. with this pregnancy physically impossible with how big my belly has gotten lol. The best thing that helps me was getting a body pillow, I feel as if I'm on my stomach so I can sleep:)
How many weeks are you?..I was exactly the same, even if I tried to sleep on my side id wake up on my stomach. But when I started using my maternity pillow it helped loads. So invest in one and eventually youll get into the habbit. Plus the bigger you get the more sleeping on your side becomes easy.