Why is the luteal phase of the menstrual cycle always fixed to 14

How to know how long my menstrual cycle is - Quora

What is the luteal stage of the menstrual cycle? - Quora

Why do I get gassy during my menstrual cycle? - Quora

How does one calculate the different stages of the menstrual cycle

Why do I get gassy during my menstrual cycle? - Quora

How to know how long my menstrual cycle is - Quora

What is the regularity and duration of your menstrual cycle? - Quora

Could someone knowledgeable explain the entire menstrual cycle

What effect (if any) does the moon have on menstrual cycles? - Quora