Luteal Phase defect

What is the luteal phase defect. Is progesterone the treatment ?
or is there a way to understand the luteal phase and come to a diagnosis and treatment

[@DrRuchikaGargGynaecologist]

I like yorr approch

[@madlenj.4644]

what if my luteal pahse went from only beeing 16 days short to bleeding constantly? No Ovulation anymore. Please answer.

[@nestoralbarico8339]

Is corpus luteum form after intercourse or corpus luteum form even without sperm?