What should I know about pyelonephritis while pregnant?

Cause and Treatment. It can be a serious problem that results in premature delivery or abortion. If you were told of this you should immediately contact your obstetrician.
Preterm labor. Your chances of going into preterm labor are higher if you develop pyelonephritis so we treat it aggressively. Your doctor may put you on a daily suppressive antibiotic after you have been treated to prevent another episode from happening.