Why am I having a period after two weeks

Like the other person who answered said I am not a doctor but some people are irregular meaning they can have a period for longer or shorter times or not a set schedule versus other people and like the other person said it could be your body adjusting

Okay, so this is a tricky subject. I am not a doctor so I may be wrong, but if your just starting out on your period your cycle can change before it has a steady or regular cycle. It may just be your body adjusting or changing due to any health problems you may have.