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trust opk - more reliable than temping. if there is an egg developing it is always released by the lh surge, so the reliability is 90% (if one says 10% ,may be unovulatory) if one does not miss the surge. bbt according to recent studies was reliable in 40% cases.

Clearblue is good at predicting, but temps are ur confirmation, so I'd stick with 19/1 as ur O day.
Opk's predict, temps confirm. A positive opk does not guaranty ovulation.
Good luck! =))

Do you have a chart we can look at?

You can have an LH surge, thus a positive OPK, and not ovulate. Temping and CM are confirmation of ovulation. Hope this helps!