CM a brownish color?!? WHAT IS THIS?

Bree • I`m 27 yrs old and have one son (8). I just had our second. Not sure if we're done or not.
CM check was a light brownish color and very sticky. Had sex on Oct 30th and Nov. 2nd (during my window according to glow) It's weird because it's only the CM it's not like when I normaly get my period. No extra blood. WHAT IS THIS!?!?