I'm female. And nah, it's not extremely low. I mean it's really lean but it's not dangerously low. 12% or lower is usually where the problems start. Amennorhea usually starts around 10%. i mean, I'm gonna be sensible about it. If I start feeling or looking sickly, I'll adjust my goal.
As for your scale at home, it depends where you carry your weight for which direction it's wrong in. The current from the scale takes the shorest route through your body so it's basically only guaging your legs and hips. If youre more top heavy the % on the scale is low. If youre pair shaped it's high.