It's not recommended I wouldn't
My ob told me that it was alright so long as I did it professionally and went outside to let it set. I have dyed my hair during pregnancy before and the baby turned out just fine. But be sure that your hair dresser is willing to do it in a well ventilated area. Mine sets me right by the door with the door wide open and a fan on to dissipate fumes. If your really worried about it ask your ob and go with your gut.
I did mine, my ob said to check the ingredients and stay away from bleach and ammonia...and to make sure the room is ventilated...never had a problem yet!
I'm a nurse.its.fine as long as no bleach and you are.in a ventilated area. I have 3 kids and dye mine every 8 weeks. They're perfectly healthy
Wait till second trimester.
I have been doing my hair for years now and I have done it monthly since I got pregnant but I use the garnier olia and I am super happy with the results. It dosent smell at all and it has no bleach.
Use something more natural I use Daniel Field water colours, they are superb!
I'd researched a lot and asked stylist friends and gotten mine done early on. It is recommended that you highlight and not do a full dye job and in a well ventialted salon/room.