Is it safe to dye my hair at the salon?

DeAnna • Pregnancy Confirmed Sunday July 13, 2014, Due March 21, 2015 (:
Hey Ladies, 
 I am 17 weeks 4 days, have a hair appt booked for tomorrow to do an all over colour and get rid of my highlights (going low maintenance). Is it safe to get this done?? I'm nervous and don't want to do anything to harm my unborn babe.