Luteal Phase

The latter half of the menstrual cycle during which the corpus luteum produces progesterone to maintain the endometrial lining of the uterus in the hope of a fertilised egg. When the corpus luteum stops producing progesterone it disintegrates and your period begins.

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A "defective luteal phase" is when the length of time during which progesterone is produced (ie between ovulation and menstruation beginning) is insufficient to allow a fertilised egg to implant as the lining has begun to disintegrate. The length of the luteal phase can be observed by using Natural Fertility Management; ideally it should be longer than about 10 days.

For more information see:
Progesterone
Natural Fertility Management

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