Implantation bleeding?

Hello, I’m 4 months post partum. 9 days past ovulation and 5 days before my missed period. When I wiped tonight I had a small amount of light pink spotting only when I wiped. We are not trying for a baby but also haven’t taken any precautions besides pulling out. What are the odds this is implantation bleeding? Or is it more likely just my period coming early? I have had some minor stomach cramping feelings today but nothing crazy.

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