Infertility is defined as the inability to get pregnant despite having frequent, unprotected sex for at least a year. In trying to discover the cause of a female patient’s infertility,

Infertility is defined as the inability to get pregnant despite having frequent, unprotected sex for at least a year. In trying to discover the cause of a female patient’s infertility, her doctor ordered an analysis of circulating hormone levels every day during her 28-day reproductive cycle. Her progesterone levels started very close to zero ng/mL on the first day and remained there throughout her entire 28-day cycle. Based on these results, and your understanding of progesterone, explain why this female is unlikely to achieve a successful pregnancy