re safe, but make sure you try to use the most natural and low- or ammonia- free
dye you can find. It will say on the box. I dyed my hair in the 2nd tri with my son, and I may
dye it in the 2nd tri with this pregnancy. You just have to make sure the room is super ventilated.
But AnnieBrooke had a good suggestion, to err on the side of caution you could always just do highlight treatments if it makes you nervous.