What stomach pain is associated with a recently placed iud?

Mild cramping. Mild cramping is normal after insertion of an intrauterine device. Ibuprofen should be sufficient. In a small percent of cases it is possible to develop pelvic inflammatory disease (pid) after insertion. If the pain iss seveere and not relieved by Ibuprofen you need too be seen by your doctor. It is rare to get PID after an IUD especially is sexually transmitted disease testing was done.
Infection. If you have developed pain since having an iud placed, you need to be checked to rule out infection, perforation, displacement or other problems.