well said Nai

I am a hairdresser also and have done many pregnant womans hair. Its safe as ppl have said. wont do anything to ur baby. A skin test is a good idea, only because ur body now may react differently when pregnant than before. Try not to pick a salon that is really really busy as there will be more fumes floating around etc. When u have the colour on ur hair.... go outside if u must (they usually have a courtyard or something) they will come get u when ur colour needs to come off..
I hope that made some sense.....