Here me out...

Okay so my period started on december the 27 and ended January the 7 im keeping track of my fertile days beacuse were trying to concive our second baby. I had sex on the 8th of January when i was 33% fertile and then 22%fertile  and the day after that. Okay so afterthat i starded spotting with mucus on the 18th of january and im still just lightly spotting could that mean implantation?