Seat belts work for everyone, including pregnant women. Like all occupants, they are more likely to be seriously injured if they do not wear seat belts.

A pregnant woman should wear a lap-shoulder belt, and the lap portion should be worn as low as possible, below the rounding, throughout the pregnancy.
The best way to protect the fetus is to protect the mother. When a seat belt is worn properly, it is more likely that the fetus will not be hurt in a crash. For pregnant women, as for anyone, the key to making seat belts effective is wearing them properly.
Lap-Shoulder Belt
Seat Belt ExtenderControl Valve Lower Body Assembly Cleaning and Inspection Automatic Transmission Unit
Control Valve Lower Body Assembly Cleaning and InspectionCalloutComponent NameWarning:Valve springs can be tightly compressed. Use care whenremoving retainers and plugs. Personal injury could result.Caution:After cleaning the transmission components, allow to air dry.Do not use cloth or paper towels ...