How many days after you are supposed to start your period that you miss should you begin to be concerned about being pregnant

How many days after you are supposed to start your period that yo…?

http://www.chacha.com/question/how-many-days-after-you-are-supposed-to-start-your-period-that-you-miss-should-you-begin-to-be-concerned-about-being-pregnant

If your period is at least a week late and you are sexually active, you should take a pregnancy test or go see a doctor. Thank you