You can sleep on your stomach until you're uncomfortable.
I miss sleeping on my belly :/ lol enjoy it !! Doesn't last long at all!!
Your 20 weeks and can still sleep on our stomach? Lucky! I'm 17 and I been not able too but I've only gained 4lbs.
Im 37 and i can still sleep on my stomach.. just at a weird angle with a pillow under one side..
Im 34 week and a still sleep on my stoamch I am comfortable
i should have taken advantage and slept on my tummy when i was 20 weeks. I did not do it because i was being extra cautious. now im 34 weeks but ever since i became 26 weeks i cant even sleep on my sides. baby kicks alot and it hurts down there when i try to switch sides or get up. so now im forced to sleep sitting up and that hurts my upper back because im not letting that rest. so yup sleeping gets very difficult last few weeks. so enjoy sleep and positions now.