When to test?

So I have had 27 day cycle. Continued opk longer than usual this month and realized that what i thought was a positive previous months, was wrong and that I actually o an entire week later-- cd18/19. Typically my period would be due today but I don't know if I should be anticipating it later or consider it missed? Praying for a bfp. Today is technically 9dpo. 

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