Am I underweight?

Just weighed myself and the scales say that I'm around 6 stone, 13 lbs, (approx. 86 lbs). I'm a 19 y/o female, and am just above 5ft. Subsequently checked my BMI, which said that I'm underweight. Though, I weighed myself a couple of years back, and I was around 8 and a half stone. I don't look... show more Just weighed myself and the scales say that I'm around 6 stone, 13 lbs, (approx. 86 lbs).

I'm a 19 y/o female, and am just above 5ft.

Subsequently checked my BMI, which said that I'm underweight.

Though, I weighed myself a couple of years back, and I was around 8 and a half stone. I don't look underweight, and am questioning if it's possible to have lost that much weight so quickly by doing nothing differently??

Any advice?? Thanks :)
Update: Tbh, I think my scales must be broken, bc I don't look underweight at all, lol
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