Ive had on an off spotting Sense the beginning of August my period was due August 6 never came I…

Ive had on an off spotting Sense the beginning of August my period was due August 6 never came I just had spotting and it was brown so I wore a panty liner then it turned to ewcm with light pink but only when I wiped an I’ve had negative pregnancy test .. I took an opk test today it’s still negative but the line getting darker compared to the other days I’ve took it does anyone have any advice of what’s going on ?? My periods our usually somewhat regular