Can I get my roots coloured?

Sarah

I’m 16 weeks pregnant and have enough greys coming through at the roots to be noticeable. I have heard that you shouldn’t dye your hair when pregnant due to the absorption of a small amount of colour on the scalp. It’s my brothers wedding so there will be lots of photos and I’m wondering can I get my hair dyed brown at the roots or is it harmful to baby? Are there non harmful hair dyes?