Are you not taking prenatal vitamins?
I would rather not as well, only if I knew I was having a good diet (which by books I think I do but to calculate all is quite hard)
Since I started taking them + COD liver oil - my hair has been doing very well. So shiny! Try taking them + cod liver oil (I know that fish oils in general are very good for hair and nails)
Yeah iron is fine but my thyroid level is high ND taking medicine...
Has OB checked your iron and B vitamins? Anemia is common in pregnancy and a big cause for female pattern hair loss. Maybe iron supplements would help. But blood tests would say for sure. Also thyroid count (low or high) can affect hair loss.