Missing period, what does it mean?

vanessa

So my period now is missing for two weeks.

Last one was a week earlier and i thought it was because of climate change as i came back from holiday however, my second one which suppose to come two weeks ago still not here, neither any sign of it.

I already had taken pregnancy test to see whether maybe that is the reason although it was negative.

This is the first time it is so late, could there be any specific reason?

Maybe someone had that in the past?