Hip pain? (Not SPD as far as I can tell)

[TeniBear]

Any advice on mild(ish) hip pain? If I haven't moved in a while it feels like my hips are sort of locking up. Then when I move they crack loudly and a little painfully. Even just standing up from sitting more than twice an hour makes me walk funny now I wish I knew where my tubey belt thing was from Amelia, I reckon just lifting bub and belly up a bit would help. What can I do until my next midwife appointment? Any short term solutions until then, or long term ones I can use so I can tell them I've had the pain but I'm on top of it?

ETA: In case it's important, my hips are also a lot less flexible than usual :-/ Usually I can sit froggy-legged and rest my head on the floor, now I can hardly put my knees down let alone my head all the way there