can you have implantation bleeding around CD 28?

Meghan

I noticed some brown pinkish spotting last night while checking my cp and noticed the cm on my fingers. i know i know gross. my periods are irregular and I'm pretty sure I ovulated on CD 15 or 16 that would make me 12 to 13 dpo. I tested this morning and it was negative. should I wait a couple days to test again or give up this cycle?

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