Help! Why did I spot during my fertile window without baby dancing šŸ˜£

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Iā€™m in my fertile window this week, or I should say ā€œshould beā€ in my fertile window because my OPK hasnā€™t detected a blinking smiley face. I had light spotting this week (VERY LITTLE and Not pictured but less than from what this photo shows) the photo here is a picture of my spotting from today after intercourse last night.

What can this mean? Iā€™m nervousā€¦ weā€™ve been trying for almost a year next month.