pregnant and hot tub?

Heather
I've recently heard that you're not supposed to be in a hot tub when you're pregnant but I'm almost 8 1/2 months pregnant and before I even heard about it I was in there for hours. And it's not like it's super hot to where I'm sweating it's just warm. It's like taking a bath. Does anyone else have any input on this? Should I stop going in? It just really relaxes me and I work 3 jobs and it helps with my back pain.