Hair dye

I’ve always been creative with my hair, and I feel like everything I read about hair dye during pregnancy is so contradictory. Some say it’s totally fine, others say never, some say fine after first trimester, others say use only 100% natural dye like henna. Does anyone know what’s actually correct?? My hairdresser is booked solid through January so I was looking for a home color in purple, mainly looking at Garnier Nutrisse, does anyone have any insight into this whole thing? Thanks so much!!