I am 36 weeks pregnant and laid on my side by the fireplace for 10-15 minutes. i didnt feel hot but put my hand on my belly and it felt hot. i moved but am worried that i caused baby to get hot?

I think you should be reassured that unless you had an actual burn on your skin, you are unlikely to have affected your internal body temperature enough to have caused any problem with the unborn baby. Good luck with your pregnancy!

Agree with Dr. Siebert. What you described would not have even inconvenienced the fetus, let alone doing any harm. Wish you good health and a healthy baby!