Sore hips when sleeping

Lydia
Hi, I am 30 weeks pregnant and for the last few nights I have been waking up every 1/2 hour to 1 hour to swap sides because of extremely sore/numb hips and sides. Is this happening to anyone else? 
I've got a pregnancy pillow, normal pillows etc but nothing seems to be helping :(
Any suggestions or advice would be awesome!