Sounds like psd. Google it. It is pelvic pain and it is terrible. I get it bad
It could be the baby being head down. Whenever I was pregnant esp the last month and a half I had pressure and pain and that was because she would basically head butt me in my pelvis to try to escape into world. It was crazy weird and I would be on my feet for 9hrs and come come and still be in pain back and pelvis pain.
Bump. Im 30 weeks in 20 minutes. Same issue. Only it happens to me when I move too much, especially when im at work. Itll last the rest of the day until I go to sleep, and sleeping is hard because its so uncomfortable.