Opk results confusing

Fanny • Baby Charlotte 19/02/05 ♥️♥️♥️ Baby Ben 20/02/26 💙💙💙
Hello ladies anyone can help me try to make sense of my opk they were all taken from CD 14 on since I have long cycles and they're all negative what worries me is that the line got darker on the 4th before getting much much paler, have I missed something?

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