Brazilian blowout ok during pregnancy?

I had my hair appointment today. I have very thin curly frizzy hair so Brazilian blowouts do wonders for me. I did research and came to the conclusion at was safe to do when pregnant I got it done at 3 months. I'm 5 1/2months now I went back to the same salon same hair stylist and he told he could not do it because I was pregnant. I'm not very confrontational so I said ok and left. But now I'm feeling so sad, confused and embarrassed. Why would he do it at 3 months but not 5 1/2 ( he knew I was pregnant at 3 months also) I will see my doctor tomorrow and ask him about it. But I was just wondering if any of you ladies that are hairstylists know if it's OK to get a Brazilian blowout when pregnant.