You commented with a critical view and incorrect information that was meant to be alarmist. It was also condescending. I have been driving for more than 10 years. Don't you think I *might* have used my tiny little brain to know how to safely operate a motor vehicle? Do you understand that when you tell a pregnant person that they are doing something unsafe, that you are telling her she is a bad mother? If you are going to do that, get a fact. Don't give me your "pennies worth" or "pretty sure" or "this friend I had one time". Give me research and data and numbers. Otherwise, you can keep your opinion to yourself. Because you're right, it is between me and my doctor and my child. Two of those three, have actual, factual, real information.
Unfortunately, your one friend and their one car (likely with seats that were not original factory seats, or were not latched properly since they did not perform the basic and only safety task that seats are meant to perform) do not actual research make. I have spent a lot of time researching safety statistics of cars and what kind of cars I can safely/comfortably drive. As well as assuaging worried parents that their children could safely ride in/drive cars. All of this is because of research, reading and actual knowledge. Not a random accident that one person had one experience in.
Do a quick google search and you will understand that the ENTIRE purpose of anchored seats and safety belts is to keep you anchored and belted to your seat. If this was as common as you say, then everyone with a fender bender would be have their seat dislodged. I have been in a car the rolled over twice and the seat and seat belts were completely stationary and intact. As far as hitting your abdomen on the steering wheel: well, if you're wearing a seatbelt, that shouldn't happen. Again, the point of seatbelts.
ETA: https://www.med.nyu.edu/content?ChunkIID=14125
You are "pretty sure" that you need to sit more than 6" away from the steering wheel. This information is incorrect. You need to sit as far back from the steering wheel as you are physically able, while still being able to see over the steering wheel and hood, reach all of the instrument panels and easily depress the pedals. For some people that is 10" for some people it is 4". If that were real, then no one who is about 5' tall would be able to drive a car.
ETA: https://www.nhtsa.gov/cars/rules/rulings/airbagqa.html#Q16
I'm aware of how to drive a car. I, and my unborn child, are perfectly safe. So you can go on about your business and save someone else's life by criticizing their parenting.