Help!

I've had mine as much as three weeks late! For me it's all about stress. The more that's going on in my life (good or bad - tests, vacations, school in general), the later and later it gets.
Don't worry, I'm sure it'll come soon! But if not or if you're still worried seeing the doctor never hurts.

I think it's just your body being what it is. Don't be too scared, but if you miss it next month, I'd say to tell a doctor.

And, YES, it might be because of stress.

It's totally normal to be a week off, sometimes our hormones fluctuate and our period doesn't come the same time every month. Don't worry! :)