The Internet is full of advice recommending that you don’t dye your hair while pregnant, at least in the first trimester. this is born out of ignorance and a fear of everything during the first trimester. There is no scientific data that says that dying your hair is associated with any adverse problems, even in the first trimester. If you think about it, most female beauticians and hairstylists also become pregnant at sometime, and they are exposed to the chemicals hundreds or thousands of times more that receive while getting your hair dyed. We don’t recommend to those women that they changed their occupation.