Your.body is preparing for birth the relaxin hormone is being released and your ligaments are stretching it hurts bad try a support belt for when your out and about
The only thing that helps me is sleeping on my side and it only helps for alittle bit.
I like to put a pillow or something in between my legs i think it helps relieve some of the pressure
Happens to me to. I have to either sleep on my bavk or put a pillow under my hip but sometimes that doesnt even help