Uh where TF is my period

This is my first post here... I'm freaking out! My period is usually a day early or right on time. It's very regular. Last month, it kinda started a day or two before it was due (rusty discharge, no ) but then stopped, and started again a couple days late in full force.

This month, the rusty colored stuff started a couple days early and now it's 3 days past when my period should start and it's still just brownish discharge like old blood. pregnancy test this morning was negative.

What is happening to me 😭