pls answer: does applying cause shed?

[Ramazan]

I have noticed whenever I apply things like shampoo, oil or minox I notice some hairs in my hand. I don't shed normally (been on minox for 4 months) so my question is basically: is it normal to shed when applying stuff to your scalp? I haven't noticed any shed other than what I'm referring to. I even tried to rub my scalp to se if any hair fell out but didn't loose any..