postpartum hair loss?

bluerevolution9

Im kind of a lurker here....I usualy post on other boards but Im not sure where to post this.

 

DD is 9 weeks old and in the past week I have started loosing a lot of hair.  Im talking huge clumps every shower.  I had blood work done a week ago (including thyroid function) and everything was fine.  Im not sure how worried I should be, but its really upsetting to see my hair falling out like this.  Anyone else go through this?  In case it matters DD is EBF and growing like a weed, and Im not loosing lots of weight yet.  Its just the hair. 

 Any idea what could cause this?