Numb hip sleeping on side

I'm 17 weeks and finding sleeping on my side increasingly uncomfortable. I wake up with either pain or numb hip on side I'm sleeping on. I use a pillow between my legs and a wedge pillow in my back. Anyone else? My obstetrician said at my 15 week visit that side sleeping was all theory. So I'm giving it up and just going to do what's comfy which is on my back or belly.