I was sick for 14 days with walking pneumonia and have been well 7days. Towards the end of my illness I developed an ache deep inside my upper left thigh. Couldn't attribute it to anything, but it has stayed with me. I just woke up and now feel an ache in my left arm, the thigh pain is gone...should I be concerned? I am 56...no other symptoms. If a clot, could it be moving? It is only an ache.