Like TK, I have been losing my hair during pregnancy. I recall losing it loads when BF my daughter but not when I BF my last son.
I have been using a fantastic shampoo & conditioner called Nioxin. I swear by it. I was losing hair so much that I would have to unblock the drain hole in the shower twice when showering. Now I don't have to do it at all. The only thing that sucks about nioxin is the price, but because I use so little, it lasts me a month which is great and my hair is fantastic now.
I have been told that people can either lose hair whilst pregnant or whilst breast feeding but not usually both.
Fingers crossed your hair loss stops and you no longer need to unblock your drain holes