9 dpo and Implantation Spotting But Faint BFP in AM With FMU

Hello ladies! First question.. did you experience implantation bleeding? If so, what dpo did it occur? How light or heavy was it and did you have cramping along with it? Then my next question.. would it make sense that I would have a faint bfp this am with fmu but now am having the spotting??
I am not due for my period until the 19th but I am sure I O'd the 5th and Bd'ed that same day.
All feedback would be appreciated!!