I'm struggling with OPKs! I started using the clear blue digital OPK back in June and I've been TTC since January this year. In June on CD 14 I got my first postive! I told my girlfriends and they thought it was weird I only have one postive. So I bought the first response OPK and was Still using the Clear blue brand too. Aslo I learned not to test in the morning and to test in the afternoon so I did. Since July I haven't got ONE positive OPK and I'm scared. I feel like I'm ovulating every month I have sharp pain and cramping where my ovaries are around CD 11 and last for 3 days. So I'm not sure what to do. Anyone else have this problem?