B.C.
My doctor was pretty laid back, she always said if it was something that was bad for the baby it would most likely be uncomfortable for me, she not only okay'ed a heat pad she also told me it was unlikely that I would be comfortable in a tub that was "too hot for the baby" so she said if I wanted to take "hot" baths that was alright as well. She was right, as much as I had LOVED hot baths pre-pregnancy I could not stand water to be that hot while pregnant...I think if you are keeping it on low you will be fine. I do recall being told I could Not use icy hot...