Late AF

Jana • 27, married, criminal law, healthy mama w/ 1 boy, TTC #2.

AF is late two days. Usually right on time or early. Two BFN since yesterday, dye and digital.

Only one other time AF has been late and that was due to stress from moving.

I’m wondering if anyone else had a late or missed period and had BFN but still turned out to be pregnant?

Is this common or really rare?

Thank you.