Can you dye your hair while pregnant?

My husband and I are trying to get pregnant. My ovulation is on the 1st. My hair now is platinum blonde and has to be dyed often to stay maintained. I planned on going to a salon to get my hair dye to my natural color so I would not have to dye it but worried what if I was pregnant? Hair dresser can’t get me in tell January 24. What would I do?