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 ExtenderDriver or Passenger Seat Retractor Side Belt Replacement Seats
Driver or Passenger Seat Retractor Side Belt ReplacementCalloutComponent NameWarning:In order to prevent accidental deployment and the risk ofpersonal injury, do not dispose of an undeployed inflatablerestraint seat belt pretensioner as normal shop waste. Undeployedseat belt pretensioners contain su ...