I had my period about 2 1/2-3 weeks ago, & i realized my spotting. ?

Spotting: Spotting can occur for many reasons from hormonal imbalances, stress, infection, pregnancy, bleeding disorders, medical disorders, growths..... If it becomes a pattern over 3 months, then follow up with gynecologist

Irregular periods: 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.