Last period 4/6/18 30daycycle started having cramps & light pink spotting/bleeding 11 days before period. had sex 7 days ago. what could this be?

Needs testing: Irregular periods are one of the most common problems Obgyns treat. If this is a 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. The pain and discharge need to be evaluated by your doctor for infection.