Hi Lalitak
No need to panic, as long as you stick to the plan, and drink your water you will lose weight. Remember your weight fluctuates daily and it's much more advisable not to keep getting on your scales at home and wait until your official WI with your CDC. I know it's not easy but you'll end up getting yourself worried over nothing and that's when people sometimes get fed up and eat something.
The low calorie content on this diet means you have to lose weight plus in week one your glycogen store is emptied, with it's water which results in a good first WI. Don't despair, hang on until your WI and I'm sure you'll have a lovely surprise.