I personally still dye my hair i have asked my midwife and hairdressers about it and they all saw asking as you are in a well ventilated area it is okay the only thing is they say while your pregnant sometimes the dye won't turn the way you wanted or hoped also you can paint your nails and cut your hair...... i have acrylic nails and never have once had a problem!!! Don't believe everything you hear i hope that helped!
You can use any kind of dye it's completely safe !
Ammonia free is better is the smell tends to bother you
I haven't done it myself but I have been to the salon and had it done. Just make sure it is a well ventilated area
If you use ammonia free dye, ive dyed mine several times throughout