All I know is that having up to 35/36 day cycles is still considered normal. You must have ovulated cd 21-23 then.
I had 27- 33 day cycles. It was never the same exactly for those 11months we tried. The luteal phase stays the same, it's just the length that changes. So I would o'd anywhere between cd 13 - 19.
At least you know you have tried your best this month Cinderella.
It's just so hard isn't it. xxx