I haven't had my period in two months

You are pregnant

Many factors could be the cause.

First, how old are you? For many young women, its common to have delayed periods simply because you're hormones are still fluctuating.

What kind of birth control do you use? Buy a home pregnancy test and see if you're pregnant. They only cost a few bucks. Or if you're 40 or older, consider it may be menopause... but still get a test kit.