The menstrual cycle involves an exquisite balance of feedback loops, with luteinizing hormone kept low for the first 14 days, peaking mid-cycle for ovulation, and FSH rising and falling across the first 14 days.

“the menstrual cycle itself is a just absolutely Exquisite balance of feedback of L luteinizing hormone kept low and constant at least for the first 14 days of the cycle then midcycle there's a peak and that's typically when ovulation occurs that's why pregnancy is most likely during the middle of the 28 day cycle FSH kind of goes up and then down across the first 14 days”