I've been using OPKs to try and track ovulation for the last two cycles. Haven't had a positive yet even though my CM has suggested ovulation around CD 14/15 each month (I have 28 day cycles so that makes sense). But not a single positive OPK even when I use them several times a day. The line will fade for a few days, then darken again a bit... just got a pretty dark one again today even though I'm pretty sure I ovulated about a week ago. CM is dry and creamy today too so not fertile looking (sorry if TMI!) They are worse than useless at the moment because they are making me stress that I'm not actually ovulating.
Anyway - OPK sticks - arghhh!