Man, I was so hyped waiting for the pregnancy growth spurt! With DD I got NO extra growth, and my hair seemed to even grow slower than before!!!!!! But that was pre-LHCF, and I didn't take care of my hair at ALL.
I'm currently pg with DS, and man was I hoping for some extra growth! Nope. Just my regular growth rate. The texture changed a little... less curly, more wavy. But I had my hopes up.
I didn't get postpartum shedding either time, though. I didn't lose any extra hair at all. So I guess it's a wash.