Hi -
I actually had a very similar situation last cycle. Started very light pink spotting CD17 (I have a 25-day cycle), then brown with a drop of red, then it disappeared for a day. I was hoping it was implantation or late ovulation spotting, but just turned out to be pre-period spotting. I actually wound up getting my period 3 days early that cycle (CD23).
But that's just my story. Like olderMom38 said, anything is possible! Good luck!
Anything's possible!! Good luck and let us know.
It sounds like it could be mid cycle spotting? I suppose it could be implantation, however that is typically quite light. Good news is, only 2 more days and you can find out for sure. Best of luck to you!!