Not Losing... I don't understand

It depends on your weight. When I weighed between 350 lbs and 250 lbs I could eat 2200 calories a day and lose weight. Now, at 210 lbs, I have to eat around 1800 to lose weight. Any more than that and I maintain or gain weight. Cut out all of the garbage foods. Yes, one can lose weight eating garbage calories and be under your calorie goal, but you will fuel your body more efficiently by eating whole foods. I also stayed away from bread, and pasta during my main weight loss. No because of a diet plan I was on, but they are high in calories. A food scale is essential. Weigh everything. I used to throw my veggies in a pot and cook them, and I counted them as generic, one green bell pepper, one tomato, and the like. I was grossly under estimating calories. Now, I weigh all veggies. Makes a big difference. Also, you need to wait longer than 3 weeks to see more results. You may need to adjust your calorie intake to lose fat. My body would lose fat more than lose scale weight. I never saw both loses at the same time. You did not put all the weight on in 3 weeks, so you shouldn't expect to lose it all in 3 weeks.

Try taking pictures and measurements. Often times, we are so used to seeing ourselves for what we think we look like...it takes some time to see our progress. Take pictures once a month and then put them next to each other.

If you're not measuring, then buy a tape measure and start recording your measurements. In the past 4 weeks I've lost nine inches and one whole pound, so it can be a big difference. Take note of your waist-hip ratio too. If I was just weighing I'd have been totally discouraged by now.