You lost 11 pounds in three weeks which is ABOVE the average loss of 2-3 per week/10 per month. It is also typical to have a low or no loss week in week 3 and/or 4 as your body adjusts to this new eating plan. NEVER look at any single week. Some weeks are more, some are less, some are none, some are a slight uptick. You are looking at averages, not individual weigh ins. Be SURE you are measuring for inches lost which are far more important in seeing actual fat loss.