Late period?

So it’s September 1 and I was supposed to get my period on the 25-26 of August, but there have been no signs yet. My last period ended on the 30-31st of July, so I was a bit surprised there’s been no signs yet. So it has now been 5 days with no signs yet. I know it could just be an irregular period or maybe my cycle has changed, but just seeking some reassurance. 😅

Side note: I took a pregnancy test on Sunday night - 29/8 but it was negative.

UPDATE: Don’t worry guys, my period arrived today. Turns out my cycle had just changed, but that didn’t stop her from making me worry! 🩸