Yes, it sounds like a piece of the synovial lining is catching in the joint, to me, anyway. I think a few days of taking it easy and resting when you are not at work is probably called for right now. I know that my synovial lining was adhered to the joint in a few places which contributed to my problem with adhesions. I would not panic, just relax a little more and cut back for a week or so to see if it makes a difference.
Tomsgirl, if you still have the catching in a week or so, you could always call your OS for an appt for him to look at it. 60 Mom, I am glad that you made the decision to see him.
Right now, my hamstrings are tight after skiing, so I have been stretching them too.