racking my brain here... I think this is right...

With regards to O, you would expect it around 5 days after you take the last tablet. So if you take it Cd5-9 then you would expect to O around cd14.

With the OPK it will register a false positive while you are taking the tablets... So, again, this was a while ago, I would wait 3 days after taking the last tablet and start OPK. But basically my Dr said to forget OPKs and just DTD every second day from CD10 - 20 and that should cover it. I then had my BT on CD21 to confirm O, which, for me, came back positive each time.

Good luck with your ttc. xo