Hair color

What is everyone's opinion on dying your hair while pregnant? I've read a lot of posts saying it's fine as long as your in a well ventilated area, but I'm still unsure if I should do it or not. I haven't dyed my hair since I found out I'm pregnant (almost 26 weeks now) but I did use a color remover and hair color when I was pregnant but didn't know yet.  I'm just so sick of what my hair looks like and want a change, but I also don't want to risk anything.