I have had my tubes tied for 4 years now and this month i was a few days late and it lasted only 3 days now i am having brown mucus why is this?

One-time symptom?: A doctor can check to see if there is a medical issue, if a woman has mild menstrual-related symptoms. Many women have some variation of mucus discharge, of periods, or a missed period on occasion. Some women feel normal after a few days, but others have bothersome symptoms and follow-up with a doctor. Some symptoms can be from fluctuations in a woman's hormones from time to time.