Anorexia weight gain

So.. I am currently recovering from anorexia. I am very underweight and I think in order to restore weight to a healthy weight for me to get my period back and stuff I could gain around a stone maybe a tad more.

If people have experienced anything around this thing.. could someone tell me how much of a different a stone weight gain is like physically how different would I look? As someone who is underweight and gaining a stone if still be classified as just under underweight. But around a stone, would I look drastically different?