This week I started having this really strange symptom. I know you are supposed to sleep on your left side,but every time I try to my left hip goes numb. Before I became pregnant I would always sleep on my right or left side but now my back is the only place I am comfortable. If it helps I badly bruied my tailbone 4 years ago (it was probably cracked but I never got it x-rayed or anything so I don't know for sure).