I went almost a week before AF showed. The more time that passes and you start stressing about if you are or not, and the tests and the fact that they are negative your just delaying her more. If by 2 weeks you still haven't seen her you should probably go see your doctor and get your blood done, I hear some women don't show up on test except the blood one sometimes. Otherwise just try and chill, and not stress about it. Try and distract yourself with other things and whatever you do don't symptom obsess! most of the time you'll create phantom symptoms where you wouldn't have any by desire alone.