Although soaking in a relaxing, warm tub can be an excellent way to not only cleanse your body, but during pregnancy it can do double duty by also helping to relieve your stress. However, it's also important to know that the temperature of your bath water is important to monitor during pregnancy.
One reason is that water that is too hot will not only dry out your pregnant skin, it might also harm your baby, increasing her risk of birth defects, or even the risk of miscarriage. Ideally, water that is around 100 degrees is ideally suited for the pregnant body.
However, if you just can't live without at least an occasional steamy soak, The American College of Obstetricians and Gynecologists says bath water can go as high as 102 degrees—but at that temperature you shouldn't spend more than 10 minutes in the tub.
Additionally, don't add more hot water after you've been bathing for a while unless you use a bath thermometer, even if you think the water is starting to cool. The reason: As your body becomes used to the warmer water, you lose some sensitivity to the heat, so you may not realize how hot your bath actually is.