It could be pelvic girdle pain or if pain is more at the front of ur pubic area it is spd. Google both terms. Ifu could get a lend of a tens machine and put it just above your buttocks and leave it on for one hour every few hours it might help u abit. Dont put it on the front or it will send u into labour.
11 days to go for me. Having the pain in my hips and butt too. Mine goes down my left leg. Dr. Said its the baby pinching nerves. Should go away soon. Try hot bath. And have you husband/ partner rub it for you. It helps me. Hands and knees with upper body resting on a chair or couch. Works to take some of the pressure off too.
Baby Has Probably Dropped :) Congrats And Good Luck. Your Almost At Home Base :)