Hi Laura Lou I have continued to have my hair high lighted throughout my 2 pregnancies. My understanding is that the chemicals are ok for pregnant people, however, you must ask your colourist thier view and perhaps go for a lower bleach if that is what you have. At the end of the day, if you are at all concerned, it's 9 months of no dye, look forward to a good hair cut and pamper when baby is born