Just wondering how common it would be to Ovulate and never get a positive OPK? I think i'm clutching at straws!! Every time I've used OPKs I've not O'd! Yesterday I tested OPK twice and I think I'll continue that for a few days. BTs usually pick up O on CD24 which would mean I O around CD17. Well I'm CD 16 and only negative OPKs. If I put in higher temps for the next 2 days on FF it comes up with an O date of CD15. But I got a negative OPK. Hmmmm. Would you mind checking out my chart?!