I haven't had a period since November, and its late January. Im 15. I have no signs of being pregnant other than the missed period thing. I don't want to go to the doctor, and I can't get a home pregnancy test because I can't tell my parents. I really hope Im not pregnant, but what else could it be?

Have you been having sex? If so, there is a possibility of pregnancy.

You can buy a home test in a pharmacy without a prescription and just use it in the bathroom without anyone knowing. You can also go to a family planning clinic or women's clinic and ask them for a test if you'd rather.

There are lots of reasons a 15 year old might have missed periods: dieting, lots of exercise, stress, teenage hormones. But if you are having sex, then pregnancy is another possible reason.