As long as your past your 1st trimester
Make sure the room is well ventilated or the fumes may make you feel sick.
But othetwise it's fine x
I did use ammonia free you can buy it at cvs n such. And make sure you're in a well ventilated room :)
Youre fine. People who do hair for a living dont just up and quit there jobs. I did with my first throughout my whole pregnancy and everything was fine(: