I have the same problem I'm losing my hair and at first I thought it was because I had dyed my hair twice in 3 days but it has been continuing to fall out even after taking prenatal and using good shampoo and conditioner. So your not alone and I thought I'd tell you that. And there is not much you can do but make sure your hair stays healthy so after birth it will go back to normal.
I called my OB and all his assitant told me was she thinks its normal, every pregnancy is different, talk to the Dr when you come in.
Not very helpful cause I don't have an appointment till Dec 28th!
Is there anything I can take? A vitamin or something
It happened to my friend. She had it during pregnancy and for some time after. Her hair is back to normal now. Id def mention it to your OB tho..