Will this be my first missed period

[Lushmetender]

Was due my AF about 12 days ago. Feel v uptight and premenstrual. We had a long haul flight about 2 weeks ago. In 47 and periods had started being less predictable in terms of timing but usually every 28 days. Having a really crap time at work and this mood I’m in is not helping.

It's too soon to say :)

Longhaul and time differences are known to upset women's cycles (cabin crew find that a lot) as is stress.

A missed period is one that goes completely AWOL. So you'd skip it completely and go another 4 weeks from when it was due ( or even longer.)