3 Month Postpartum Headaches?!

Brittany • Due May 30th, 2016 ❤️
I'm 14 weeks postpartum and all of the sudden I've been getting headaches (which I never have). I've also noticed that I'm losing a little more hair than normal. 
Can anyone tell me if there is a big hormonal change around 3 months postpartum or do you think it's unrelated?