It has been 40 days since I had the Mirena IUD inserted, why am I still bleeding?

It has been 40 days since the insertion of the Mirena IUD, and bleeding is still occurring. This happens because the contraceptive device is a foreign body in the uterus, which can stimulate the endometrium and lead to irregular vaginal bleeding. Over time, the endometrium will gradually adapt, with an average adaptation period of about three months. Bleeding usually resolves after this three-month period. However, if heavy vaginal bleeding occurs shortly after insertion, you should return to the hospital for a follow-up ultrasound examination.