A woman with regular 28-day menstrual cycles begins taking a medication that significantly shortens the luteal phase. Which consequence follows?

💡 Explanation

A shortened luteal phase reduces progesterone secretion needed to maintain the uterine lining. Consequently, the embryo may fail to implant or be sustained, because the corpus luteum does not produce enough progesterone; therefore, sustaining a pregnancy becomes difficult, rather than an altered LH/FSH surge, thickening of cervical mucus or suppression of FSH.

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