I had so many pillows DH eventually moved into the spare room Poor man only had an inch to sleep on. That, and the constant waking and adorable pregnant wife snoring.

I ended up with a big wedge pillow to prop me up to help with heartburn and a normal pillow on top of this. I had a little belly wedge pillow for under the bump. I'd move it as I switched from side to side. I had a long pillow for between my knees and ankles (I had to keep my knees together due to SPD and it would hurt without one). Then another one behind my back to stop my rolling over when i was on my side. I had a belly bean and this was OK in the start but not so much at the end. Sadly there was no cure for the hip pain except swapping sides or sleeping on my back.

I would position all my pillows, then crawl in and adjust them. Sleep on one side. Get up to loo. Readjust all the pillows and sleep on the other side. Repeat multiple times all night.

DH did get to use the wedge pillow when he got the flu and couldn't breathe properly, so it wasn't all for me