It's so funny, I was going to post a very similar question. I'm also really annoyed with my roots. My Dr. said I need to wait 'till week 16 to get any color done. I guess it just depends on the Dr. When I was pregnant with my daughter , the doctor said I could get highlights at any time, because they don't touch the scalp. So I am waiting this time 'till after week 16, but my hair looks awful!
-1st
hey girl- im a hairstylist and i do my hair all the time. well ive put bleach in it about 3 times since ive been preggo. its fine as long as you dont do it all the time and the area is well ventilated. products these days arent as harsh as they used to be. i think you will be just fine!