Fem & Men opk timing help.

Elseelou

Normally O around CD13. Final dose of men on CD11. I know you shouldnt test OPKs until 3 days after last dose to avoid false positives, however with my last dose and natural O that doesnt leave many days to test. My question is what do you ladies do? When are you starting you OPKs after final med doses? Thanks so much!