As the others have said...don't forget to subtract the total fiber from the total carbs.
I too do not lose if my fat intake is too low or if my carbs are below 15 "net grams". (That's what I call my carb intake AFTER I subtract the fiber). DO NOT stop eating your veggies or else you may start having troubles in the bathroom! Or if you are already having troubles, this may be another one of the things keeping you from dropping any pounds.

But don't get discouraged. Your weight loss will be slower than other's because you don't have as much to lose. Three weeks isn't long enough to tell. Be sure to read the WHOLE book--not just the chapters on Induction. It will help you to see the overall lifetime benefits of this eating plan. It's not a quick fix, "lose 10 pounds in a week" diet. NO DIET out there is going to do that for you.
Good luck! Keep hangin' out here. We're all cheerin' for ya!