When you're pregnant you should avoid being in hot water but warm water is okay when pregnant.
Being in a hot tub for example would not be safe for pregnancy because the temperature of the hot water in the hot tub would or at least could harm the baby and cause death to the unborn baby or at least harm the baby.
But warm water such as in a bathtub is okay for you and the baby when you're pregnant.
A bath water temperature of 98.6 F or lower is safe during pregnancy and any hotter temperature of the bath water than 98.6 F could harm the baby.
You can safely take warm baths when you're pregnant but avoid taking baths that are too hot.
A warm bath is okay when you're pregnant as long as the bath water is not hot enough to raise your body temperature higher than 102.2 degrees Fahrenheit for more than 10 minutes
A bath water temperature of 98.6 F is not too hot for a bath when pregnant and is perfectly okay to soak in the bath water at that temperature.
Just don't get the water in the bath hotter than 98.6 F and the baby will fine.
If you take a bath when pregnant in bath water that is hotter then it could cause harm or death to the unborn baby.
I've soaked in bath water that was just warm when pregnant and the babies turned out just fine and healthy.
Warm showers are also okay to take when you're pregnant.