what determines luteal phase length
The luteal phase is the second half of your menstrual cycle. It starts the day after ovulation and ends the day before you get your menstruation period. The length is usually consistent each cycle. The average luteal phase length is typically 14 days long. But normal ranges are from 10 to 16 days in length. If it is shorter than 10 days then you may have a luteal phase defect. The average 14 days is where the two week part of two week wait (2WW) comes from. The 2 week wait is another term used to describe this phase.