Hair dying while pregnant

Mazie💕🤷🏼‍♀️
I'm oh so tired of my hair, my roots are out of control and I wanna do something to it so bad.. Well I finally know what I want to do but it requires me bleaching my hair a bit. 
I'm 24 weeks pregnant and I wanna do only one strip in my hair blonde while the rest is brown.. 
So what I want to know is if it's okay to bleach that one spot while pregnant?
If I may add my whole head is already blonde so it would mainly be root touching up!