I sleep on my belly too but not all the way like
I use to and I also usually put a pillow underneath!!
I am the same way. I have a pregnancy pillow but I feel like I'm drowning in it since I'm on 4'11. I've been laying on my tummy but towards one side more to help me but my bones hurt.
I'm a belly sleeper too. As soon as I found out I was pregnant, I started sleeping on my side. I had trouble with my hips too. I suggest some hip stretches. Look up yoga poses for tight hips. Pregnancy pillows, even just a normal pillow under your areas of pain, lean again your partner, like back to back..
You need a pregnancy pillow, one that's specifically made for pregnant ladies. Try to make a habit of laying on your side and back. Even when you're just relaxing and not asleep, lay on your side or back. Do whatever it takes to make you comfortable