In a well ventilated area,non bleach dyes are fine. Always talk to your doc though.
Agree. You may have it on your 2nd trimester. Ask for the one that has less chemicals on it. If im not mistaken there are dyes that are organic. Much better to have those than to risk with the one who has chemicals.
Not in the first trimester or the third. You can in the second trimester. The chemicals in the hair dye can start labor.