Super short first PP period?

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So I had a positive OPK (not a peak) but same color line test on Sept 3. so I thought I was finally ovulating. On Sept 7 I had brown spotting then 8th & 9th a period flow and nothing since. I’m wondering if my positive was just a surge before my “period”? This was my first PP bleed since weaning from BF (12.5m PP). Anyone have a similar situation happen?