Bill, I would say you are on the slow side. If the pain you speak of is not SHARP but more like arthritis pain as you describe, then its probably nothing serious (at least this early).
But here is what happens. During surgery, after they install the new resurfacing device, the surgeon flexes your leg all over to see that it can go where it should - knee to chest, backwards, to the side, etc. Once you wake up from surgery, you won't bend your hip like that anymore because now you can feel the discomfort. It can go there, you just have discomfort.
At my three week check up, my surgeon took my foot and knee and tried to bring it up to my chest and I tell you it made me groan and pushed him away the pain was so bad. He was so angry at me and said I have to get this flexibility like he ordered now or the tissue will be too stiff once it has healed. He said there is going to be lots of discomfort trying to regain flexibility but that is much different than sharp pain that could mean something wrong.
DON'T TRY THIS AT HOME: I had found that trying to bring my left knee up to my chest like my surgeon asked required more strength than I could apply for a 20 second hold. I actually got into the passenger side of my wife's car, bent my op-side knee and placed it against the dashboard and pressed the electric control to bring the seat slowly forward. VOILA! It was like having a stretching partner who could help you hold a stretch. I only did this maybe five times total, but the result was great. After that I had enough flexibility that I could lean my body weight over to hold the stretch.
So the point is that my early flexibility was something I had to force and it was not comfortable. But each new bit of range that I achieved really helped reduce a lot of other "pains".
Don't know if I helped or not.
Chuckm