I only have the capacity to tell you whether you surely have a stutter or not. During the initial days of my stutter, even I used to stutter rarely and because I spoke fluently my whole life upto that point, in many cases I would not stutter at all. Stuttering was a very rare event...but it kept increasing and increasing where I knew for sure that I had a stuttering problem. The same can apply to you as well and you can actually be in the process of developing a stutter and only in time would we know whether you have a stammering problem or not. I just hope it rectifies... Although...if it has been a year since it started and it hasn't worsened...there is a good chance that it is not a stutter...well it can be a case of a very mild stutter as well.