Unprotected sex before period by 8 days& partner came outside& 4 days later bleedin like heavy period for 5 days& severe cramps. period or pregnant?

Take a test: 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.