What causes on and off spotting for 8 days. now 1 and 2 days past ovulation fever of 101.3 . headache and middle back pain on right side only?

Spotting: 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 to help regulate the menstrual cycle. Schedule a visit for headache.