11 days after the start of my period i'll have a day with a few hours of bleeding with some cramping or a few days of old blood discharge.

Common problem: 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, endometrial polyps, fibroids and hormonal changes can cause spotting. There are many options available to help regulate the menstrual cycle. Schedule a visit.