As a hair stylist myself for the last 13 years I can say I've heard all different view points and opinions from my clients about what there doctor's have said regarding the taboo "do I color while pregnant or not" issue. I am a hair stylist that performs all services. I honestly think as long as your being smart and cautious you will be just fine. The hair colors used by trained, licensed professionals have also come a long way in how they are formulated for safety. A well ventilated salon and a hair color line that is low to zero ammonia would be sufficient. Getting your hair foiled instead of a base color retouch is another option since color sits in the foil and doesn't come in contact with your scalp. I think if you're considered high risk that's a no brainer to avoid as many factors as possible. I am newly pregnant with our first child (6 weeks) and I can't quit my profession just because I am pregnant. Many hair stylists have been having babies while working and things seem to turn out just fine. As for safety concerns there is always a risk in anything but there has been no hard documented studies confirming this is unsafe. I think it's a decision each individual has to make for themselves. Hair a lot of times can be unpredictable during pregnancy due to hormone switches so doing something dramatic is never a smart move. After all we all want to make the best decisions for the best outcome and safety of our little ones but we can't all live in a bubble either.