Your post starting it was on the 9th - had you started it a few days earlier? I'd actually consider that important because it would mean the different between day 15 and day 21.
Since nothing seems to be happening, let me ask some more questions about your setup.
What ammonia are you using?
What is your filter?
Temp?
Did you dechlorinate the initial water, and any water you have added?
Do you know if your tap water is hard or soft?
pH?