Get in touch with some local midwives & see if someone offers yoga for expectant moms -- some teachers do. You could learn some gentle stretching exercises that may help shift your internal organs around a bit & give you some relief. My friend who teaches yoga had several special classes for people with different physical stuff going on. She teaches Iyengar style, where the emphasis is on supported poses, correct alighment & creating more internal space. I did Tai Chi during my first pregnancy & it really helped.