Safe hair dye..? 10w2d

Sandy
Crazy I know, but who doesn't want to still look good and feel good while pregnant?!
I have yet to let myself slip as I feel even more beautiful now then ever, but there's one thing.. I need a touch up lol. 
I read that there are some safe natural hair dyes available. I only need to touch up my roots about 1/2 inch with natural brown. 
Has anyone dyed their hair yet?