I had the same thing.

Lost 21lbs in the first 3 weeks, saw no change in the way my clothes fit.

The NEXT 21lbs were huge though. I dropped from 3XL to 2XL, size 42 pants to size 38 (I'm male and wear them around the hips). I lost about 4 inches off my waist as well.

Don't get discouraged, things are about to get good ;o