Is heated yoga safe during pregnancy if it's always been part of your work out routine?

Cassie
I just found out that I am almost 5 weeks pregnant. Typically I attend two heated yoga classes each week. Not bikram hot, probably around 80 degrees F at most. I've seen multiple pregnant women in my classes before but now that it's me I'm worried it could harm the baby. 
Has anyone else had experience with this? I know it's important for me to stay active but if the heat will harm the baby I'm going to have to find something else. 
Haven't had a chance to talk to my doctor yet so I was curious if glow had any experience to offer.