Just make sure you are in a well ventilated room when coloring your hair :-) the color itself can't harm baby, it's the fumes. As long as you're not inhaling particularly concentrated amounts of the color solution, you and baby will be just fine! :-)
I was told to not use box dye. Professionally dying it is the best option
Im nine weeks can i dye my hair without harming my baby
I just had mine done the other day. Make sure the room is ventilated so it doesn't make you nauseous.
It is safe to dye hair using ammonia free dye and not putting them directly on the roots of your hair :-) hope this helps