Pregnancy Cervical Mucus? TMI

AF is due today. I get PMDD. I'm a tad irritable today, but could be attributed to being off one of my meds for over 24hrs now. I have very minor intestinal cramps(nothing like my AF misery), which have subsided slightly since being able to take a quick bathroom break.

I should be spotting and cramping at the very least today. Instead, I wiped, and to my surprise, my CM is dark yellow/brownish(doesn't appear blood tinged or pink at all). I do not have any symptoms of irritation, itching, anything down there, so this is most likely internal cause. I've never had THIS MUCH CM before AF, and cannot recall a time it was ever this color(besides mucus plug late in pregnancy).

Could this be a sign of implantation, current or recently? I'm just so hoping we do not have to go through another Clomid/trigger cycle. It has been very hard on my body and emotional state.