How long before OPK should be positive? (Pics)

Hope • Baby girl 08/05/15 Baby boy 11/28/18
How long does it usually take for an opk to be positive? It should happen in the next few days yes? I am unfamiliar with first response as I usually use clear blue digital easy. I am also temping and bding every day until, just using this as a back up. Current bbt this morning was back to the usual 97.7
Thoughts??

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