@sushi_is_cringe the luteal phase in women is when progesterone is highest. progesterone opposes estrogen and prevents ovulation. you could pick a katharina dalton book like Once A Month and it'll all be there. ray was of the opinion women can just take progesterone and remain in the luteal phase indefinitely, until you maybe you wanna conceive and then you'd eat something with vegetable oil (estrogenic) to induce your period
https://raypeat.com/articles/articles/progesterone-deceptions.shtml