Yoga and pregnancy-hot room

I'm 15 weeks and just took a yoga class. If felt really warm in the room but I knew it wasn't a "hot" yoga class. I was drenching in sweat after a few minutes. I stepped out to run to the bathroom and saw the room was 91 degrees. I'm now freaking out that I harmed my baby being in that room for an hour and a half. The instructor said she had other pregnant students but wanted to see if anyone else knows about this or been in a similar situation??