Menstruation may become heavier. In the first three months after insertion, your periods may be different from normal. Most women experience little to no discomfort from the copper IUD, but others may experience side effects, such as:
heavy, prolonged and/or irregular menstruation
abdominal cramps (sometimes severe)
intermittent blood loss
After about three months your body will have become accustomed to the IUD and the natural cycle will recover. A small number of women continue to have slightly more blood loss during their periods.