I had mine done after the first trimester, and went to Aveda and had the foils only. I told the stylist to do her best and try not to let too much touch my scalp.
Yes, i had my hair done at about 9 weeks pregnant, i dont think its looked upon as 'harmfull' anymore!! My midwife told me it was ok but for some women the dye doesnt take to the hair as good as it usually would but mine came out fine! =]
My OBGYN advised against it when i was pregnant with my son especially in the first trimester but i only get the foil highlights and the color doesn't touch my scalp so i went ahead with it anyway. i know other women that have gotten their hair dyed with color on the scalp and their babies were fine so it's all what you feel is right.
I have heard mixed things about this. I was told by my hairdresser that once you are out of the first trimester it is okay. Especially you use the foil dye method.
I was always to scared to do it! Check with your OB first!