Hi Creblue, I can sympathise - a couple of weeks ago I had some what I would call strong discomfort deep in the joint. Strangely enough I had never actually had pain in the joint before my op, it had all been down my leg and in my back so this was a new concept to me.
Like you I had been a bit too eager with doing things during the day, so decided I had overdone things. Rested up well the next day and all was fine again. It does ache a bit from time to time, but as the others had said there are a whole load of muscles and nerves mending in there so it will be something that will happen for quite a while.
I am sure you are doing really well - keep it up, but make sure you get plenty of rest too.