Shedding eyebrow hairs too?...

Hey there!

So basically, I decided to go on fin about a week ago for some pretty bad thinning on the left side of my temple. As a result, I've been checking up on my hair shed, and I've been noticing short hairs on my pillow and desk,assuming they were just from my scalp. Just recently, however, I had an itch in my eyebrows and gave them a scratch, and to my surprise, a few hairs fell out of my eyebrows! In response to this, I tried plucking at my eyebrows with moderate strength, and more and more eyebrow hairs kept coming out!

My questions is: Is this a part of the fin shed, or is there maybe some underlying issue(maybe thyroid related)? Because honestly losing all my eyebrow hairs would really suck more than losing hair on my head...

Any comments or suggestions would be appreciated, thanks!