Janice - average losses are 1-2lb a week with a band, so to have lost 7lb in one week, you're already way ahead of what is the average.
Also, the weight loss will go up and down, you wouldn't be able to maintain that sort of loss on a weekly basis, but it will even out. Also, you've been on liquids only - and on a very low amount of "food" and calories, as such, the body will hold onto its energy resources because its not getting fuel going into you via food. Some people refer to this as the body going into "starvation mode" whereby it will hold onto what its got and by eating more you will kick start that weight loss. Sounds odd, but it took me a while to find and learn that my optimum weight loss actually comes in at around 1100 cals - (with a certain carb/protein content) but if I find that when I have a fill and am then back to liquids only, my weight loss decreases due not taking in enough.
They do say its normal, it is. With a band they also say that you shouldn't really expect to be losing a great deal until you start getting your fills and eating in the way that you should. As such, you should be more than happy with what is a big loss having a band and also, be prepared that it will go up and down, but think of an average loss of 1-2lb each week, but there will be stalls, there will be a pattern form, but as you move into eating foods and getting into that pattern and routine everything at this point is a bonus.