I didn't lose a ton the first 3 weeks either. Most normal people that aren't super morbidly obese don't lost that much at first. Your body is healing and also on a starvation level of calories. Wait till 8 weeks to start complaining.
It is likely the 3 week stall that is so often talked about. Give it some time. You will be shocked what the pounds add up to in a few months and then at a year, etc.
