Mom's hair falling postpartum

I read somewhere that after giving birth, the thick hair that women enjoy during pregnancy starts to fall out as levels of estrogen (the hormone that lengthens the time of the growth cycle of hair) drop. I think mine just started to fall out last week. Baby was five months and one week old. I'm still breastfeeding exclusively, but she has started to eat fewer times and has gone for longer stretches of sleep at night. For me, the hair didn't come out in chunks or handfuls. I just noticed a little more in my brush and a lot more tangled in my hair ties when I pulled them out. So long thick hair...