Hair loss!!!!

I am 15 weeks along and is anyone else losing crazy amounts of hair??? I about cried last night due to the amount that came out of my head during my shower! It started a couple weeks ago and I always thought you were supposed to get nice thick hair then lose it after! Not during!!!! I take my prenatal vitamins and calcium pills everyday! Just wondering if anyone else is losing crazy amounts of hair in shower or when they brush through their hair!