I'm keeping a close eye on my CM this cycle. I'm CD11 today and normally get a positive OPK around CD18. This month I'm taking Agnus Castus so I'm hoping to OV a little earlier (normally what happens when I take it.) Today I've had a little bit of watery/egg white CM so I've done an OPK which was negative as I expected it to be this early in my cycle. Just wondering what is more accurate in terms of determining how fertile I might be? The neg OPK or the CM? According to Fertility Friend (based on the CM) I'm fertile but my OPK is saying different! HELP!