I just ended my period 11 days ago, and it has come again today. i received really bad news yesterday that stressed me out. is this normal or do i need to see a doctor?

Menstrual blood: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections ; hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test . There are many options available to help regulate the menstrual cycle. Schedule a visit.