When would you start testing?

This is my seventh month on Letrozole. I've been getting 27-30 day cycles for the months I've been on it. I never got a positive ovulation test this month☹️. But I likely ovulated (I always do, i have no ovulation issues according to my doc; I think I just missed the surge). We bded cd9, 13, 17 and 19. When would you start testing? I am on cd22 now. I know I should wait til missed period, but I'm not sure when it is due, and I like to know whether to expect it.

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