Accurate tracking

Hi All,

I'm very new to this forum and to TTC.

Just wondering for accuracy sake what do you classify as end of AF/beginning of the fertile window. I know this seems obvious... like duh when it stops. But what about the the minor darkish spotting right at the end? Would you start your fertile window once just the red stuff has ceased or wait until no colored discharge at all? Any advice would be greatly appreciated. 😊