The limited evidence that's available suggests that it's probably safe to dye your hair during pregnancy.
If you are concerned you could consider waiting to color your hair until the second trimester, when your developing baby is less vulnerable. Also, instead of using an all-over hair color, consider a process like streaking or highlighting, in which the chemicals have little or no contact with your scalp. (Any hair-coloring agents absorbed into your system would come through your skin, not through your hair shaft.) If you are doing it yourself make sure you leave the dye on your hair no longer than directed and that you rinse your scalp thoroughly after using hair dye.
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