I get exercise. missed my period by 7 days. back pain. spotting after sex. negative pregnancy tests. no discharge. cold sweats. cramping but no bleedi?

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.