I'm 15wk s I just dyed my hair yesterday
I was told 2nd trimester is fine try to avoid during first
My doc recommended you better not do it, but he also said 99% of his patients do it anyways.
I was told it doesn't matter as long as the area is ventilated and you're not getting dizzy or nauseous from the fumes. I'm just letting my roots grow out since they are close in color. Just to be safe. :)