Hair dye

Hello ladies!!!!!! I'm 5 weeks today!!! And actually we are getting married in the 26th!!!! I have a hair appointment next week to get highlights. I'm really nervous is this safe, all the research I've done is wishy washy with the answers also my first doctors appointment isn't until the following week!!!! I called the nurse hotline and she said it was fine but that's not coming from the docs mouth!?!? Any advice