The most common and most life-threatening injury caused to pregnant women during a car crash is placenta abruption. Placenta abruption can cause the placenta to be prematurely detached from the uterine wall, which cuts off blood flow to the placenta. That’s a delicate attachment, and it doesn’t take a lot of force to detach the placenta. This is obviously a critical medical condition that can be fatal not only to the baby but also place the mother’s health in serious and potentially life-threatening danger. Internal bleeding, severe abdominal pain and dizziness can result from a case of placental abruption.