Ovulation

Glow says i should be ovulating today i have been testing past couple of days opk's are negative, even today so stressed m i ovulating?? I havnt noticed that much cm this month too but its only when i wipe i notice, have been taking evening primrose oil this month could this have affected my cm and ovulation?? Last month has lots of cm and had positive opk someone plz hive me some reassurance thnx