Positive OPK then bleeding...

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I’ve got positive OPK’s since august 2nd (even tough it was really early in my cycle CD 9) and now I’m spotting since august 6th.. what could it be ? It was my first month <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> but I’ve never bleeded like this before in the middle of my cycle..