It's been a long time since I was TTC my son and although I used OPKs then I can't remember when I would start to get darker lines. I've come off the pill and my body seems to be going back 'normal' I'm having all the right symptoms for what I think is CD12/13 lots of CM, I'd say on the verge of EWCM, cervix is very high and soft but I'm only getting very faint OPK lines. Prior to the pill I would ovulate around CD16-17. Has anyone else had complete negative then suddenly get a strong positive? I'm sure when I used them before I would get progressively darker lines leading upto it? Maybe I'm too early still.