baths are fine as long as you don't overheat nor dehydrate yourself. The theory with spas is that because the blood vessels of cervix are enlarged, there is a TINY chance the bubbles can go up the vagina and hit the cervix and a bubble could enter the blood stream (or so I read somewhere) which can be serious. To be safe, have baths only "warm" not too hot and if you are going to be in a while sip cool water. You can up the bath temp after about 14wks. (The theory there is that excess heat can damage the developing bub as it is at it's most fragile untill then). Goodluck honey. There is nothing I enjoy more, pg or not than a nice hot bath. But I just made sure it wasn't TOO hot when pg.