Sorry to hear your not starting on monday, I know how frustrating it is having to wait, by time i start it will be two weeks since i decided to start CD had to wait till pay day which im very glad to say is tommorow.
Im sure when you start you will soon be losing weight and as the others have said use this time to prepare cut back on the carbs, increase your water intake, if your a coffee or tea drinker get used to it black with sweetners, you dont want to go through the whole caffine withdrawl bit as well.
Me.