I'm 19W and I'm having the SAME issue since I found out I was pregnant with baby #2. With my daughter I didn't have this problem.
But with this lil boy I'm just like you I'm terrified to brush my hair and to wash it cause it seems like that's when I'm pulling handfuls out. I've been taking my prenatals on and off through this pregnancy cause they get me sick I've been drinking water. And everyone tells me its normal it will stop once the baby comes? But it still scares me! Sometimes I even cry my hair has gotten soooooo thin it is crazy how thin it is. But after I have this baby I plan on taking prenatals and hair skin nail vitamins like crazy to hopefully get my hair thick again!
Are you taking your prenatals?