How to relieve pressure off diaphragm

Ok mommas and mommas to be...I'm 33 weeks and feel so stuffed. The baby tends to like to position herself right underneath my diaphragm making it hard to breath. I've tried getting on all 4s which helps temporarily, and then sometimes I just lay me whole hand across the top of my uterus and push down...any other suggestions? It's so uncomfortable when she's positioned this way...