Why is my period late? Not pregnant?

My period always comes on like clockwork. Usually earlier than it's supposed to. But I'm 2 days late.

Before anyone asks: I'M NOT PREGNANT!!!
I have not had sex in about 3 months (used protection and plan b), and since then I've had my period twice on schedule with no issues.

I'm really stressing since it's never late and I haven't had my usual PMS symptoms.

Any of you other ladies have any clue what the issue could be?

I'm sure me stressing over it not coming on time is not helping matters but I can't help it!!!
Why is my period late? Not pregnant?
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