Hi gymchick :)
I am not really sure why you have not lost anything yet...could be a number of things or a medical reason. Each person is different, and as with the person in a previous post, I too have over 100 lbs to lose. I think it comes off a little quicker when your body has so much extra to spare. I would say to be sure to eat at least 3 meals a day, and be sure you are consuming enough calories and fat, as recommended by the plan so your body doesn't feel like it needs to hold onto any to keep you running. Maybe see if you can get one of the dieticians to give you some recomendations or check with your Dr.
Good luck!!!!!