I too have this problem Catherine and the only solution I have found is turning onto the other side (of course is this a major effort though )
So at 34wks I sleep for approx 1-2 hrs then am awoken by pain, to do my 12 point turn (haha) and then get back to sleep for another 1-2 hrs...lol

Similiar to AJP - I have a long pillow that goes down the side of my body (I kind of hug it) and between my legs...and this has worked really well until this last week....so that might help....but will be watching for other solutions also