Non permanent hair dye?!

MomOf2 • Married 💏 DD:4yrs old 👑 Angel Baby 5/6/2014 👼 My Rainbow Baby! 5/21/2015 👶🍼💙
So my doctor said I can't dye my hair, nor bleach it  till 4 weeks after I enter the 2nd trimester??
She said I could do "non permanent hair dye"?! I don't even know what that is?? 
I imagine those Halloween hair paint spray thing?? Lol! Ugh I have horrible roots, since I'm a brunette and have a super light blonde color!!!!
What do I do?! I wanna listen to her but then again I've seen so many pregnant women dye their hair all throughout their pregnancies!! 
My doctor said it's not safe because of the "fumes" while in the process?! But what if you're well ventilated and have like one of those face masks on?
Help!! 
Thanks for reading! 

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