Cause for late period other than pregnancy?

Ryah

I hear a lot of people say stress can delay periods but I feel like my base line is always stress. And there’s been no increase in that for all of a sudden my period to switch up on me. I took an early result pregnancy test day of missed period and a blood test and both were negative. I know for sure I’m not pregnant. Is this my cycle starting to change? Only 21. So I’m unsure. This happen to any of u ladies?

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