Girls only lol

Before anyone starts metaphorically killing any rabbits, periods can be a few days late or a few days early. It eventually happens to everyone. Just give yourself a few days.

Generally speaking, you've got to put your body under a fair amount of stress in order to stop your period from happening. Less than a week of changed habits is very, very unlikely to have caused any major cycle changes. Cycle changes are caused by either excessive stress (through exercise or limited dietary calories over an extended period of time) or from hormone changes due to body composition changes, when it comes to a changing lifestyle making cycle changes... so... I would say this probably has nothing to do with your less than a week of changing things up. Periods are not clockwork, you can only know a predicted day for it to start, there's no guarantee that your body will start it on the day you predict. I'd just chill out unless you hit more than a week over. If still late, and you've had sex, might be time for a test.

So glad I had a hysterectomy.

Are you pregnant?

Take the test. But yes, my period will come later if I've had a whoosh in weight loss or changed up my exercise routine a bunch. Happened two months ago. But I know it's going to be late because I can feel myself ovulating late.

Mine is so consistently on time, it's more reliable than the buses. Most of the time I'm regular by the hour. Literally- I'm not exaggerating. However, I've still been late by a week before. One day, two days- heck three days late isn't a worry even though I could count the times I'm that late on one hand in the last decade. Breathe. Take a test, I find they usually let you sleep a bit better if you're worried. But besides that just keep in mind bodies are awesomely weird and sometimes the wind could blow too hard and it throws you off. That's okay and normal.