I had implantation bleeding at 8 DPO, got a BFN at 9 DPO and then got my BFP at 11 DPO (I was still spotting).
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For me the big tip off was bleeding at only 8 DPO. I have a relatively short luteal phase but not that short!
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(Interestingly enough, I pulled up my old 2009 calendar to look all this up and I can see that I got my + OPK on CD 14, we DTD that night and then not again that cycle. That was on Oct. 23 and my DS was born 9 months later, to the day :))