Try keeping a soft pillow under your bump and one between your knees to relieve back pressure. It really helped me get good rest, which is so precious before the breastfeeding sleepless nights begin!
With two babies kicking inside, sleeping was a nightmare! I literally made a fortress of 5 pillows—one under my head, one behind my back, one between my knees, and two more just to stop me from rolling over. You have to find what works, even if you look like a mummy.
My mother suggested using traditional cotton pillows around the waist. But my doctor said sleeping on the left side is what actually improves blood flow to the baby, so I kept one pillow between my legs for comfort.
My pregnancy app recommended sleeping on the left side and using a dedicated C-shaped pregnancy pillow. If you don't have one, just tuck a regular fluffy pillow between your knees and one under your belly. It really helps support the alignment.
Honestly, don't waste 2000 rupees on those fancy pregnancy pillows when you have hospital delivery bills and baby tests to plan for. Just use your normal home pillows under your knees and side, they do the exact same job for free!