Ttc 8 months

Sara
And we have used opks 5/8 months. I have gotten positive opks every time I used them but different days. January cd 19, February cd 18, April cd 17, June cd 11&12 and July cd 13. Is this normal for it to be all over the place and when would you recommend we bd if we don't use opks (please comment this last part). From what I have noticed if my cycle is longer I ovulate later and if it's 28-29 days I ovulate earlier

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