week 13: sharp pain on left butt

Hi mommies! Im experiencing sharp pain on my left butt everytime i wanna lay down and get up, also from sitting to standing up. Is this normal? cause gynae said its the bones moving. but its so painful like having stiff necks but at ur buttocks. it feels like the nerves are inflamed. been going on for a month now :( any recommendations to soothe the pain?