How much weight does one typically lose on the Atkins diet, specifically, phase 1?

I'm on day 8 now, and I've lost 8 pounds. How much is normal?? That seems quite a lot in such a small amount of time. I was on a simple calorie restriction diet for the week before this one, and lost 5 pounds, which was the water weight I'm sure. Any help with this would be greatly appreciated. Thanks.