Fig. 2

Changes in serum levels of luteinizing hormone, estradiol, progesterone, and human chorionic gonadotropin (hCG). The serum hCG level was tested also in a residual serum sample taken at the referring hospital. Ovarian stimulation had been started by the patient’s previous physician on day 1 of uterine bleeding (after a negative result was confirmed in an hCG urine test). However, the patient was later considered to have been 4 weeks, 2 days pregnant at that point