my doc said highlights were ok because the dye doesnt sink into your scalp like all over hair color does but i know a girl that was preggers the same time as me and dyed her hair like 4x. I only did highlights because i was nervous
my doc said the same thing as carli26, make sure your in a well ventilated place. Even for all over color, neither of them seep into your skin to cause any issues to your baby. i got my hair colored on a regular basis and other than being SUPER sensitive to the smell, i had zero issues.