Had period last month for 4 days. Then 3 days after that had pink spotting for 2 days. 5 days after that brown thick discharge. What does that mean?

Possible... With an abnormal vaginal discharge it is possible you might be suffering of an infection in which case you would need to be examined for a final diagnosis and treatment as necessary. It is also advisable to get a pregnancy test since this could be a possibility if you have been sexually active.