Everyone loses weight from different places at different rates. For me, I always lose from my stomach first, and then other places follow as the weeks go by.
If you've measured after only 1 week of being on plan, don't be too disappointed that you've not lost more inches... it would be fantastic if we could wake up after a week of following a plan and be 2.5 stone lighter, and be 3 dress sizes smaller, but as I've always said, it's a marathon, not a sprint. It doesn't happen instanlty, and I'm sure if you keep measuring yourself (whether it's weekly, fortnightly or monthly) you'll soon see the inches dropping as well as the pounds
It doesn't mean you are putting weight on (unless the scales are telling you that you are) but try not to focus on just one, focus on both the scales and the inches.
You will get there