Ay, honestly ang dami ng namin nag-worry about this kasi gusto pa rin magmukhang presentable habang pregnant, diba? Haha, pero since it's a health thing involving chemicals and your baby, mas better talaga na i-check mo muna with your OB, sila ang makakaalam kung safe for your specific pregnancy stage at kung anong brand/type ang okay. A few of my mum friends waited until second trimester or just did highlights instead ng full color para mas konti ang chemicals, pero iba-iba talaga ang advice ng doctors, so best to ask yours directly para sa peace of mind mo.