My hips and pelvis have been very sore throughout the night for some months now and I finally got around to putting a doubled over doona under the sheets on my side of the bed and I can't believe the difference it's made! I suffer from other aches and pains now but my hips have been so much better since I added the extra padding to my side of the bed. I also read that a piece of foam works well too.

I'd also recommend seeing a physio who specialises in pregnancy related issues. My physio has been great for my preggy issues and I got a sacro lumbar support belt through them for my back and that has really helped too.

Good luck!