I got my hair coloured when I got in to the second trimester. My hair dresser said it was fine to do so. I wanted to get a full head of blonde foils but she told me that it would be better just to tint the roots and give a few foils. She said that having too many foils may ruin my hair due to being pg. It might only be a blonde thing, not sure?! But I have to say, I LOVED my hair when it was all finished, best hair colour I have had!