about hair

Shannon • mummy to Amelia♡
So I'm 17weeks&3days pregnant today. And I have a question. 
Are you aloud to dye your hair while being pregnant?!
People are saying yeah aslong as it ain't got ammonia init and aslong as it ain't got hydrogen peroxide. 
I've been searching for hair dyes without them ingredients in. Can't find anything. 
Anyone know any best hair dye makes without them ingredients in? 
I'm from the UK. 
REMOVE if it's not aloud. Thank you