O on Letrozole

Lori

1st round taken days 3-7. Opks aren't reliable for me usually (Pcos) they're always dark. I usually do get a blazing +, ewcm and fertile cervix though. Usually O CD 25 or later with just metformin. CD 14 today. No + yet but close on CD 10 and 11. No other fertile signs though. Someone who took Femara before is saying I likely missed my surge. Do you think I could have Od already even without the telltale signs?