7day luteal phase?? Last cycle was 13?!?

I'm so confused last cycle it looked like this ff showing OD on cd 28 and af started cd 42 so I had a 41 day cycle and

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The menstrual cycle is influenced by weekly and lunar rhythms

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7day luteal phase?? Last cycle was 13?!?

Luteal Phase - What it is and how it impacts you

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