Testing questions

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Driving myself mad at the moment. Generally have short cycles, average of 24 days according to my app. Now on day 27, had BFN on last 2 days with 2 different tests. DTD day 8 and 12, estimated OV day 11. Also had random spotting day 14. Trying to keep level headed and assume I would have had positive result of I was pregnant. Any thoughts appreciated!

Probably delayed ovulation. That would make your period late by the same number of days ov is late. Not to say you won't get your bfp, but it's likely you ovulated a bit later than you usually do. Perhaps it was ovulation spotting cd 14?

Delayed ov is super common. It's also not uncommon to have a cycle where you don't ov.