JACKSONVILLE, Ill. — Heather Crivilare was a month from her due date when she was rushed to an operating room for an emergency cesarean section. The first-time mother, a high school teacher in rural Illinois, had developed high blood pressure, a sometimes life-threatening condition in pregnancy that prompted doctors to hospitalize her. Then Crivilare’s blood pressure spiked, and the baby’s heart rate dropped. “It was terrifying,” Crivilare said. She gave birth to a healthy daughter. What followed, though, was another ordeal: thousands of dollars in medical debt that sent Crivilare and her husb…