Trying to conceive and past 5 days i had brown discharge on a panty liner each day, period not due until the 18th. several pregnancy symptoms

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.