Case 1: A 31-year-old pregnant Chinese woman (gravida 2 para 0) at 13 + 5 wk of gestation presented with intermittent dysuria for 1 mo and vaginal bleeding for 3 d and was admitted to the Obstetrics Department on October 8, 2018.
Case 2: A 27-year-old pregnant Chinese nulligravida presented to the Obstetrics Department with intermittent urinary retention at 17 wk of gestation on December 26, 2018.