I think it's a good sign, it doesn't mean you were necessarily close to an LD, but the fact that your using logic in a dream means that the logic part of your brain is on, and you can recognize dream signs and abnormalities easier. I believe natural lucid dreamers are really just people who keep their logical brain working when they sleep, so they can figure it out easier. That would mean that you can get lucid easier than some people.

Other thing is you might want to use bad math as a dream sign. Just RC when something doesn't add up... If this is only a recent thing I'll bet youll be seein more LDs soon