Hello, I have gone through your query and understood the concern. It is possible to have abnormal menstrual pattern with the Mirena IUD as with the other hormone contraceptives. Yet, since you have had almost regular menstrual pattern all these months which implies hormone balance, this discharge should be considered abnormal. Chances of ectopic pregnancy are raised with intrauterine devices and in view of your history, I would ask you to go for a proper clinical appraisal immediately. A sonogram of the pelvis should be done to detect any ectopic pregnancy. If negative, you can be treated for hormone imbalance after excluding local causes like infection, polyps and erosion. Hope this helps.