Have you ever had a skipped/delayed period due to stress?

So I started my junior year of college on Monday the 26th and I was due for my period that Friday the 30th and it has been a week and I still have not gotten my period... I normally have very perfect 28 day cycles so I’m very confused and stressed about the fact it’s still not here yet... I read in some places that stress can cause a period to be delayed or even skipped (and trust me my stress levels shot up once the first day of school hit but nothing out of the ordinary) so I wanted to get some stories or advice regarding that. I did take a couple pregnancy tests, one after 3 days late and one in the morning of 6 days late because I did have unprotected sex on post-ovulation days but both were negative so just confused....