Does erratic shedding (day by day difference), indicate MPB or the opposite.

[Somewhat worried]

I've been doing the comb test lately every morning. 40 combs on the top of my scalp from the crown to the tip.
The average loss is about 7-10 hairs, though sometimes its more like 4, and some times its upwards of 14 (once was 17!). I've noticed also that on the days its very high loss, more hair is lost on the sides and back aswell. Also my hair grows ridiculously fast like maybe a half inch or more a month.
19/yo, i'm sure if you searched the forum you'd find my pics if you wanted them

[mmmcoffee]

Your hair is shedding because the hairs are reaching the end of the growth cycle. On any given day x numbers of hair will shed, varying because they're all in different phases of the growth cycle, there's no set amount so it's normal for it to be "erratic". On average, it's normal to shed 100-150 hairs a day. You probably shed more than 7-19 and just don't know it. still, it's a low number. If I combed my hair 40 times there would be a hell of a lot more than 20.

Unless you've noticed thinning or recession you've likely got nothing to worry about. If you notice a drastic increase in shedding then you may be starting to go through male pattern baldness