Hello people my name is Steven and I'm new to the forums

I'm 20 years old and ftm, already on testosterone for 8 months.
I am currently concerned with my hair, very much so actually. I have short hair, like this:
http://blog.dudepins.com/wp-content/uploads/2012/12/short-hairstyle-for-guys.jpg I noticed my hair falling out a ton recently, and I decided to try something. I brushed my hair once in the morning and once at night for about 2-3 minutes over a piece of white paper. I lost ~40-50 hairs, a bunch of newly growing ones and longer ones equally. Every time I brush my hair that much falls out, until no more fall out within that session. Of course, more fall out randomly during the day and when I shower. I have a rather dry scalp now, never before T though, and I'm taking care of that now using dandruff shampoo 2-3 times a week, and limiting washing my hair every 2-3 days which is just right for my short hair.
My questions are:
1. Does this sound normal to you, and how much hair do you lose on T (individually)?
2. Is the hair on the sides of your head supposed to be naturally thinner than everywhere else? Not just the temples the entire sides; the top of my head is much more thicker than the sides, where it's soft and fine, and I can see my scalp through it under strong light. Is this normal hair?
I can post pictures of my hair later to show you, both with flash and without.

One thing to mention, I obviously did not think about this pre-T and even if this was the same hair loss pattern I wouldn't have put much attention towards it, so I cannot compare