Yes, it's normal. I still have a couple of places that nag me, especially the lateral tendon. Sometimes that hurts all the way down. I don't know if it comes from the tkr or the 2 lateral releases I had on it through the years. I had my old OS from the 80s tell me that I would always have pain, even after the tkr. I was hoping he was wrong, but maybe not. Before my fall, I was pretty much painfree except for little twinges. Now, it's much worse, but I blame it on the little movement of the joint.
But, to make a long story shorter...you will experience pains in different places at different times. You might do a thing that aggravates this one area and do something else that aggravates another. This goes on for months. But, as the months go on, the pain isn't as nearly as intense. Just don't overdo!