Birth advocates like to talk about how you should trust your body, give in, let it do what it needs to do, and especially tell people who are trying to make you go against your instincts to kindly STFU. Medical science really does show that the less the process is interfered with (unless there are issues that need intervention), the better off both Mom and the baby are.
Becky Powers was 28 weeks along in her pregnancy when the H1N1 virus she contracted landed her in the hospital, in really, really bad condition. She was put on an ECHMO (heart and lung) machine and dialysis, and in a medically-induced coma with less than 25 percent of her lung capacity. She'd been given a 10 percent chance of surviving.
In this state, without being an active participant, she gave birth to her first child. Vaginally.