Last month 10 days late, this month 16 days late w/ brown discharge, next day pinkish blood w/ clear mucus, next day heavy blood, today-day 19 nothing?

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.