Common Clinical Scenario: KJ is a 26-year-old primigravid woman, 28 weeks' pregnant, who woke up with severe right flank pain, chills, and a fever of 100.1°F. Ultrasound examination in the emergency department revealed severe right-sided hydronephrosis, but no stone was seen. However, KJ's mother and brother both have a history of kidney stones. She was begun on IV hydration and given acetaminophen and morphine, and urine and blood cultures were drawn. Urine dip showed red and white cells as expected. Intravenous cefazolin was also ordered prophylactically.