I did the first time at around 8 weeks then at 15 and again at 23. Just make sure it's ammonia free :)
Yes, but box colors have high amounts of chemicals that you really shouldn't use unless you are in a very ventilated area. I personally would recommend you get it done professionally
Yes but I believe it's recommended that you wait until the second trimester.
yesssss as long as your in a well ventilated room. the chemicals on your scalp isn't the problem it's breathing them in.