How long can implantation bleeding last?

So I’m 8days late and the past 3 days I’ve had brown discharge. Had no period cramps no red blood no sign of a period. I’ve googled it and it just says implantation bleeding lasted 1-2 days but some people can have it longer! I had protected and unprotected sex in September/October. I don’t really know if I’m pregnant or not? I tested 3 days before my period was due and it’s a BFN?! What is going on?

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