I asked my girlfriend who is a hair dresser and she said its fine. The only reason they may say not to is the colour may turn a different colour than it normally does (blonde may go a little yellow).. but not always.. also she said hairdressers usually wont do it if they know youre pregnant incase you have a reaction to it and then you can sue.. nothing to do with harming the baby at all. Nothing has been proven it will effect bubs in anyway and i died mine all through my pregnancy with DS.

If youre really SUPER worried.. just wait until the 2nd trimester..