Plan b spotting or implantation bleeding?

Okay on Aug 4 I had unprotected sex and took a take action pill within 24 hours. This is my fertile week.

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I have taken them before years ago never had any issues with them. No spotting,irregular period or anything. On Aug 9th my supposed ovulation day according to my period tracker, I had unprotected sex again but this time I didn't use a plan b. 2 days later I woke up to brown streaks in my underwear and when i wiped there was brown discharge. My stomach is mildly cramping and today I'm still having brownish red tinged spotting only when I wipe. Could this be the plan b or early implantation from it failing? Would it be too early for me to get implantation bleeding 2 days after unprotected sex if I ovulated? Idk what this is but my period is due in 12 days.