question on clutch chatter

[tkd]

Ok, so I was practicing some U-turns today for about 10 minutes. I noticed that when I pulled away I seemed to get a little clutch chatter right before I released the clutch all the way. I didn't notice it in any other gears, but I did notice at all stop signs on the ride home. Is it possible that

a) the clutch was just overheated and should be fine next time I ride

b) by practicing and staying in the friction zone too much I could have permanently damaged the clutch in such a short time?

I'm due for an oil change, so I'm going with full synthetic. Hopefully that will help.

Thanks