I've gotten conflicting info on the safety of them in my last trimester. Doctor says go for it as long as it's turned down to below 100F. Nurse says no under any circumstances because of bacteria but wouldn't there be bacteria in a bathtub? And isn't that why there's a mucous plug separating the uterus from the outside world and bacteria? I have seriously bad back and pelvis pain that heat relieves. I'm already 32 and a half weeks, think it'd be alright? I can only stand it for like 10 minutes