The shaded bars show days of menstrual bleeding. The estimated days of ovulation, based on our algorithm, are indicated by the dotted lines. In the top panel, values are provided for estrone 3-glucuronide (E1G, solid line) and pregnanediol 3-glucuronide (PdG, dashed line), adjusted for the creatinine concentration. The second panel from the top shows the ratio of E1G to PdG. Days on which sexual intercourse occurred are shown in the third panel by tick marks. The bottom panel shows the urinary concentrations of hCG.


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