Hmm can someone explain cm to me.

j

Not tracking this cycle

Cm was fertile cd11 and 12 but my apps aid I won't ovulate until cd15 not sure why cd15 when usually it's cd14 which would be today... Anyways my cm does not look fertile any ore like it did two days ago .. what does this mean? Could it be I ovulated early? Or is it normal fertile cm goes when you ovulate?