It may just be variance (common to stutter), but it may also be your stutter waning (somehow). I think the important thing in a case like this is to not assume the stutter is gone, and then getting shocked or sad if some of it should suddenly reappear. Consider yourself, so far, a stutterer who has ended up in favorable circumstances, or a situation conducive to succesful stutter management. I suppose you could compare it a bit to an alcoholic being off the wagon? Not sure if that analogy is comfortable... :)