Hi Nicole,

I am facing a similar question. I am on assisted conception awaiting a froz embryo transfer as such using OPK's as provided by ivf clinic (clearblue brand). I had a surge detected yesterday, went in for a blood test today and they rang an hr ago to tell me I haven't O'd yet so need to go in tomorrow for further bloods

I have PCO (not PCOS), which the nurse said can throw out the PH levels.

I would have sworn I'd O'd today by the way my ovaries felt a little tender and from MC but it appears I haven't. Which of course makes me think I've missed the boat and will have to wait another month but I will trust the med experts to have it under control and my fingers crossed for a transfer this week!

Sorry, this doesn't help you except to know others under medical supervision are equally confused!

Nat