Side sleeping/belly feels heavy

So obviously sleeping on my side is like the only option right now. I am just over 3 weeks away from my due date so I’m not going to go buy a pregnancy pillow at this point. Whenever I lay on my side, my belly feels SO heavy that it’s uncomfortable. I’ve been tucking my comforter underneath to help support it. Anyone else? How do you get comfy? Just rolling from one side to another hurts until I get some support underneath it 😩