What Can Cause Constant Pain In Thigh,groin Area And Knee?

I've been running a lot lately but two weeks ago I was running and once I was done, I had an intense amount of pain in my thigh. It hurts to walk, run, sit, etc. I have a constant pain no matter what. I have failed the "leg-hang" test and "hop" test. I have pain in my groin area as well as knee. Could this possibly be a stress fracture in my femur?