You are OKAY.
Many women on YAZ will often miss periods, or only have light spotting instead of a period.
This is because YAZ is SUPPOSED to make a shorter lighter period.
You do not 'need' a period on birth control.
You are most likely NOT pregnant, and you should still keep taking your pills as usual.
You can take a test if you want... You should start your NEXT pack on time, even if you do not get a period.