Hello, I have gone through your query and understand your concern. As you suspected, Both are possible 1. IntraUterineDevice that are placed recently may be lead to infection or it might be misplaced or migrated. This may be the cause for your abdominal pain. 2. As you already have the history of kidney stones, these stones may be migrated down to ureter and got stuck. This may also cause the abdominal pain. But both can be easily ruled out by simple Ultrasound abdomen and pelvis. Further ultrasound also helpful in identifying the other causes when both these causes are ruled out. If it is due to IUD displacement, then it can be removed by Hysteroscopy. If the pain is due to kidney stones, better treated by Shock wave lithotripsy or removal of stones. If both are ruled out, then you need thorough examination of abdomen and pelvis to find the cause. Based on the identifiable cause, treatment varies. Drink plenty of water. Hope this helps. Please write back for further queries. Wishing you good health.