I would talk with my primary doc right away. I haven't been able to sleep on my stomach for 25 years. Sigh. It just hurts way too much, even with pillows under my stomach to elevate the spine. I am a side sleeper now and change sides about once an hour due to pain. There just isn't a comfortable position now but the stomach will always be out of the question for me. I do sleep with two pillows between my knees which helps keep me in a reasonable position. Best wishes.