I tended to sleep on my left side during pregnancy, something to do with blood flow being better when sleeping the left. The bones in my hips used to feel as though they weren't quite in the right place so I had a pillow between my legs, which held the right leg more in line and relieved pressure on my hips.

You could have a pillow under your bump if you felt it needed support. I'm not sure how necessary the wedge-shaped pillows sold for this purpose are, a normal pillow would probably work just as well. I didn't find I needed one for my bump, just my legs.

Sometimes I'd sleep on my back, propped up with lots of pillows so I wasn't flat, and with a large pillow under my knees to relieve pressure on my back.

Hope this helps a little, and I hope you get a decent night's sleep soon! Congratulations on you pregnancy, btw, and welcome back to posting on Pixies