You thought it was that time of the month, but your period didn’t arrive. Don't panic! During the teen years, your period may not always arrive on time or regularly. In fact, it can take up to two years from the time you start menstruating for your body to develop a regular cycle.
Although it’s important to remember that pregnancy can be a possibility if you’re sexually active (see a healthcare provider if you think you may be pregnant), here are other reasons that you might miss a period.