you might want to read at thread in the Memorable Thread Forum called something to the effect of "PISS"---Post Induction Stall Syndrome. Basically, for some people, they don't lose weight or inches during Weeks 3-6 of this Diet. Dr. ATkins explained it on the Atkins Videos as your body adjusting to the changes its made.
Also, start measuring yourself. Dr. Atkins wrote the loss of inches is more representative of the loss of fat than losing pounds (scale). So make friends with your tape measure.