I think I o'd already this month. Last month I had a 40 day cycle with o on cd28 and no real period. I started using opks this month and had positives cd 16 & 17. BD on cd 12, 15, 16, 17, & 19 so hoping we timed it right. I think I o'd the 17th as my temps went up a little that day then more on cd20. Has anyone had that happen where they o'd 11 days earlier than normal? I usually have 36-38 day cycles but FF is saying I should have a 29 day cycle this month.