This is my first month using OPKs and I am just curious about something. How long after you start getting an increase in CM do most of you ovulate? And how long do you usually get EWCM for during your cycle? This will be our 6th mo trying to concive and I am just starting to look more at my body and less at the calendar. I am seing an increase in CM and am on day cycle day 25 of a 38-42 day cycle. I have been using OPKs and so far they have all been negative. I just don't want to miss BD because the OPK is negative and I already ovulated. And how often can the tests be wrong?? Thanks for all your advice! Wishing you all soon!