<s>[INST] I am a breastfeeding mother, I got the Mirena IUD in 7 weeks ago, and have been non-stop bleeding since. Before I got the iud there was a possibility I was pregnant, but the pregnancy test in the doctors office before insertion of the iud was negative. I have endometriosis , so long, irritating periods dont usually concern me. What does concern me is that that last few nights, I have been having some small blood clots, and dark brown sledge for discharge, as well as, your typical period. [/INST] hi,thank you for your query.Mirena is a intrauterine device (IUD) with progestogen and is a hormonal intrauterine device.what you are experiencing are classical effects of MIRENA seen in some people.Mirena acts by inducing cyclical shedding of the endometrium.as you have endometritis the uterine lining gets thickened and hence when mirena is placed,due to the hormonal action the lining is shed as clots.And since you already got the pregnancy test done it is the endometrial cast off.All these symptoms are harmless if they are not accompanied by other symptoms such as dizziness and pain in abdomen.I would advise you to consult your OB/GYN if the symptoms persist for more than a week.and get an ultrasound done to check for placement and condition of endometritis.thank you,wishing you good health </s>