I think it is very difficult to say when to stop a medicine like finasteride or minoxidil, when it causes shedding. Strongly depends on the metabolism of the individuals organism.
For example, I was on Minoxidil 5% for about 5 months, I had terrible shedding starting at week 2. By that time, everybody told me to calm down and stick with it, "hey pall, it is normal". Well, I continued the treatment for the next months and in the end the results were .. Zero. So, I am pretty sure I lost a big slice of my frontal hair with minoxidil. But on the other hand .. I could have had success like some people had, with a similar initial effect (shedding).
I am starting Finasteride now, I am on it for about a week. Shedding started again, this time like crazy ... I am afraid of even touching my head. Hopefully Finasteride will be different this time, I put all my hope on it... Or maybe it will have the same disastrous result?? I don´t now, but you know what? I will continue it, at least all my doubts will be clarified.
As some guys have stated before, I think some people have such an unique metabolism, that are better off without any kind of hair loss treatment. I am starting to think I am that kind of people. You see, when I stopped Minoxidil, shedding stopped. I was about half a year without a single hair falling. I started on finasteride and shedding got back again like a raging army..
As for you my friend, I don´t see what the fuss is about. You have totally normal hair. Why are you on finasteride anyway?
Stick with it, and if by month 9, 10 or something like that, shedding continues, then stop. With that amount of hair, even if you loose something, I think it won´t be a great deal!
Cheers