Implantation at 11 days late ? Is it possible ?

Hi ladies I am 11 days late and experiencing brown color spotting today. I initially thought my period started but the spotting didn't get heavy and it is almost gone in few hours. I feel that implantation bleeding at this moment is too late. I have to start my first round of clomid tomorrow is this is AF and not implantation. You ladies have any idea about this ?

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