15 weeks and my hips hate me

I have never been good at sleeping on my back or stomach. But on a good day my hips get sore after so long on one side, so I toss and turn a lot. Now any time I lay down, within minutes, both hips start to hurt, and I can't get comfortable. I have tried a body pillow, but we are already experiencing bad cold weather and a body pillow is hard to switch from side to side. Any one have any suggestions for trying to find a comfortable way to sleep?