Thanks for the query.
Copper intrauterine contraceptive
device can cause side effects like inter-menstrual bleeding
sensation of the abdomen, gastritis
, abdominal cramps etc.
But these will usually subside soon without the need of any medication.
If the symptoms persist you can consult gynecologist and take symptomatic treatment in the form of antacids etc.
If the symptoms become severe you may have to think about changing the contraceptive method.
For more details:http://www.indiastudychannel.com/resources/144770-Barrier-contraceptives-intra-uterine.aspx