Early Ovulation? LH Surge CD11

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Has anyone had an odd month?

I usually ovulate the same day each month

Which was CD 13 when my cycle was 25 days

And last 3 months CD 15 as my cycle has lengthened to 27 days...

Has anyone experienced an early ovulation? Is there a reason it does?

I’m so confused.. my body is usually like clockwork.. I now feel for all you ladies who have unpredictable cycles 😭