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 ExtenderDrive Belt System Description Pulleys and Belts Accessory Drive Belts
The drive belt system consists of the followingcomponents:The drive beltThe drive belt tensionerThe drive belt idler pulleyThe crankshaft balancer pulleyThe accessory drive component mounting bracketsThe accessory drive componentsThe power steering pump, if belt drivenThe generatorThe A/C compressor ...