I'm nearly 33 weeks pregnant and after not having any physical pains through the entire pregnancy I'm suddenly getting numbness and pain right across my lower back (just on hip level) when lying on either side. Sitting is fine, walking is fine...it's just from lying down! I have pillows placed in front, just under my hip at the back, and between my knees. It's a few days before I'll be able to see a physio and I'd like some sleep before then! Any ideas on causes / relief?