I lost too much weight?

Ok so I'm a teenage girl, I used to be overweight, but then I lost weight and was in the 50th percentile. Finally average. But my doctor didn't like that I lost weight because she was afraid that I would develop an eating disorder considering I was a teenage girl. She told me not to lose any more, and i listened and the next year I ended up gaining 10 pounds. I got frustrated and started eating healthy and exercising again, and now I'm skinnier than ever. I'm probably borderline underweight. But the thing is I didn't starve myself, I just eat healthy and I'm fit for the first time in my life. I eat a lot of food, but it's all healthy so in turn the pounds naturally come off. I'm scared my doc will diagnose me with anorexia because I lost weight after she told me not to, but I eat right and I've never missed a period. Will she diagnose me with anorexia? Thank you sooo much!