You have only been doing this for a week! Give it some time. How long did it take you to get to the weight you are now? That is how I look at it. It took me about 4 years to get up to where I was at. I know that I won't loose the weight overnight. Be patient....you will see a loss if you stick with it.

Edited to add: measure yourself...sometimes you won't see weight off from the scale but you will see inches gone.