Dying Hair During Pregnancy

Nina • Proud mommy
I know a lot of Dr's say no, and I'm all about doing what's best for my baby, I stay away from everything "bad" just how I am. I seriously want to dye my hair though at the beginning of the new year or sooner ha ha. I've had plenty of friends who have, but do you think it would be okay to? I'm 21 weeks along due April 20th.