helppp!?!?!

im 15,  i  havent had my period since may 17-21, i havent done anything sexual , but i took a pregnacy test & it was negative. so i dont know .

[ChristineMP]

It isn't unusual for young women to have irregular periods in the first 5 years after they start menstruating. You may want to see your health care provider for an exam and tests to see why you haven't had your period.

I had irregular periods for many years (sometimes went up to 9 months without a period). It was probably because I was very underweight and physically active. The body needs a certain amount of body fat to cycle regularly. Once I got up to a normal weight for my size, my cycle became more regular.

This is only one example of something that can cause an irregular cycle. There are others. See you health care provider