C.H.
My doctor actually suggested to me to use benefiber when I was pregnant my first time and having difficulties going to the bathroom...also on the hair problem...I had a relaxer put in my hair and then got my hair dye..not all on the same day...but what I am saying is I asked my salon lady and she said it's just mostly a rumor but you will be fine..I now have two children and had relaxers (which are chemicals) both times in my pregnancies and they are fine...so I think you should be ok.