Implantation bleeding!?!?

Not sure when or if I ovulated (I have PCOS), but my fertility monitor showed "high fertility" for a stretch of 19 days ending about 8-10 days ago. I had light brown spotting with a small tinge of bright red/pink that lasted for two days, about 2 days ago. Glow says my period should start July 1. Could this be IB?

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