You define what is and isn't a relapse at the end of the day. If you subscribe to the 12 step definition, you are still making that choice (to believe that definition). Even within 12 step groups it varies, I've had old timers tell me that taking anti-depressants is a relapse!!! Thats dangerous.
Some consider having a non-alcoholic beer at dinner a relapse, I don't, but some do. Now, would I advise it to someone in the first 3 months? No. In fact, I wouldn't advise it to anyone. But I felt that it was okay to try after putting some time in, it didn't cause me to crave. However, NA beers have a very small percentage of alcohol in it (about the same as a glass of orange juice from a box that has sat in the fridge for a few days), so some think that you knowingly drink something with any amount of alcohol in it than it is a relapse.
I can understand people having such a strict definition, some people are so good at manipulating themselves they need a strict definition. Plus, many addicts tend to see things in black and white. You know the old AA saying "I think, thats the problem"... well I can understand why some people would say that. It terrifies me to hear it, but if thats what works than thats what works.
So basically what I am telling you is that if you do not feel it is a relapse, than it probably isn't. I am pretty sure you will know it if you do relapse. Just keep plugging along, don't be too hard on yourself and do what you need to do to stay healthy.