Leg pain sleeping on side? Anyone?

I'm 21 weeks and for the last 1-2 months been struggling every night. First hour I'm okay, but after that I feel a painful burning sensation from hips to knees on my side that gets worse the longer I'm sleeping on my side. And I get this on both sides.

I'm at the time now where I can't sleep on my back...sometimes I try and sleep sitting up (so uncomfortable), have a pregnancy pillow, etc and honestly I'm going nuts every night.

Anyone else experience this!?