I don't know why you haven't lost anything, but two things to remember. MEASURE MEASURE MEASURE!!! and Fitday.com

I found that I didn't see any difference on the scale for weeks but the tape said different...I had actually lost 6 inches within the induction period.

Also, fitday.com is brilliant and I didn't use it until someone suggested it when I was a few weeks into the diet and very frustrated and it has been an absolute godsend!
It lets you put in all of your daily intake of everything and automatically calculates the totals for fat/carb/callories ect. It's really great.

Also, you must watch your portion sizes, make sure that a cup of whatever is really a cup! I say this because I was a HUGE eater before, my portin sizes were silly really, and when I came onto the diet it took me a while to realise I was eating too much.

Good luck and keep us posted as to what happens!