Is it ok to get standard depo-provera provera (medroxyprogesterone) 150mg/l injected into your thigh instead of buttock?

Yes: As long as it's given in a muscle, it's fine.

Buttock or arm best: The standard Depo Provera (medroxyprogesterone) should be injected deeply into substantial muscle tissue. So the proper area of the buttock or upper outer arm is chosen. (The arm area where flu shots are often given). The thigh has extremely thick and dense tissue between the skin surface and the muscle and also the anatomy, including the nerves, is a bit complex. So the buttock or the arm site is best.