I got my period almost three weeks earlier than usual?

Lots of options: At your age, you could have bleeding not related to ovulation, a miscarriage, cervical bleeding, vaginal bleeding at lots of other things. Don't be scared, almost everything is fixable especially if you catch it early. Go see y our family doctor (or a gynecologist) if your family doc does not handle that kind of problem. A quick exam and a few simple tests should be enough to figure it out.

It can be normal.: If you are worried, talk to your primary care doctor...Good luck!