10 days is too short. Besides, I think you should practice more and eat more. It is also possible that you have a large proportion of lean body weight (more muscles, stronger body and less fat). Try to optimize your diet structure, with a large proportion of vegetables and fruits and meat 100G, so as to ensure the normal intake of vitamins and protein and minimize it.
Also, do not lose more than 1KG a week, which is not good for your health and will cause metabolic disorder in your body.