High FSH levels can lead to a 'double ovulation' event, resulting in irregular cycle lengths.

“So you have this sort of hyper stimulation of signaling um a hyper response of FSH follical stimulating hormone um so much so that you can get you know a loop event which is a ludial out of phase event where essentially you ovulate twice your FSH is so high it's so busy yelling at your ovaries that your ovaries are like I heard you and I heard you again and they essentially double ovulate and that's that story where you'll have you know a long cycle and then a short cycle and then a long cycle.”