If you are seeing ammonia during your day to day tank maintenance that you need to remove by water changes, that would be a concern as you arent cycled and you should be looking into the cause. Are you overstocked perhaps?
I would be doing water tests before a water change. Its more likely you will detect issues before than afterwards. These water tests arent that accurate, and lowering the parameters through a water change before a test might give you a false sense of security.