There is no evidence to suggest that dying your hair causes miscarriage. I am 7 weeks and 5 days. On Wednesday, I went to the hairdresser for a trim and some foils, she didn't touch my scalp anyway but she had chemical free hair dye (no ammonia), there was no odour and it came out perfect. Everyone has their own views on this subject but there are organic products out there with chemical free dyes. You could always ask your hairdresser anyway. Good luck in all of your pregnancies girls.