Not ovulating

My husband and I have been trying to get pregnant since September. This is the third month I've used opks. I'm always got a positive the last 2 months, but I'm not getting a positive this month. I don't feel like I'm anywhere close with because I have NO cm.  Just this cycle I started using Fertilaid and Ovaboost. Would this have anything to do with it?  Feeling discouraged!  ?