say NO to hair chemical

I just had my hair trimmed yesterday. The hairstylist was trying to convince me to do rebonding and recoloring to my semi-damaged hair but of cos i refused. What if the chemical flows into my body and affects my baby. She ensures me that it will not happen and even docs would allow it. How sure she is? Nothing will make me change my mind to do anything to my hair now except for trimming it shorter. I just need to be patient for about 4.5months more.