Any Spotters Around 13 dpo?

Florence
Glow predicted that my period would come around the 15th, fertility friend predicted the 14th. It is now the 12th and I have spotting and cramps. Think it's too late for implantation bleeding? I did take a test and it was BFN. I'll let you ladies know if AF ultimately comes, or if I get a BFP. (I know it's important for research purposes :))