The luteal phase and Follicle-stimulating hormone are linked because FSH levels during the late luteal phase influence granulosa cell activity [1], and FSH levels during the follicular phase directly impact the duration and health of the subsequent luteal phase [2]. Furthermore, both are key components in the hormonal regulation of the menstrual cycle, which is defined by the distinct roles of FSH and progesterone across the follicular and luteal phases [3].