Dont get period's, very rare i get brown discharge, had sex same day as brown discharge! cud i b pregnant? suffering wid cramps an pains in lower part

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.

Unlikely: May be it is better to see your PCP for evaluation and work up.