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Dear Kallie,

Thank you for your post and welcome to EmpowHer.
There are many reasons why your period could be late, not necessarily pregnancy, though this is what is usually presumed.

A major culprit is Stress-- many women who are going through a tough time in their lives tend to have a change in their period.

Other factors include:
Excessive weight loss or gain. Although low body weight is a common cause of missed or irregular periods, obesity also can cause menstrual problems.
Eating disorders, such as anorexia or bulimia. For more information, see the topic Anorexia Nervosa or Bulimia Nervosa.
Increased exercise. Missed periods are common in endurance athletes.
Illness.
Travel.
Medicines such as birth control methods, which may cause lighter, less frequent, more frequent, or skipped periods or no periods at all.
Hormone problems. This may cause a change in the levels of the hormones that the body needs to support menstruation.
Illegal drug use.

For more reading on this, visit:
http://women.webmd.com/tc/missed-or-irregular-periods-topic-overview