Over 4 years ago I generally O'd on CD16 or 17, with a 31 day cycle, but that was obviously a few years ago and I have had a child, a medical abortion and a miscarriage since then.

I've never O'd as late as CD21 or 22 hence why I think that's a highly unlikely probability, and I have charted in the past. In the past 12 months or so the longest cycle I've had is 31 days, with them becoming progressively shorter, but for the last 5 cycles have been 27, 28 or 29 days.

Thank you