Lower body aching

I'm at Week 19 now, and I'm having quite a bit of pain on my lower body. Sleeping on the sides have caused my hips and part of my ribs to hurt through the night. I often feel tired so I sit a lot throughout the day. But now my buttocks hurt, my hips hurt, my lower back hurts and standing up to walk more tires me to no end. A soft cushion isn't really helping either. Does anyone have any solution or advise from this?