It is normal to experience some discomfort in the lower abdomen after having an IUD inserted. This discomfort usually lasts for about 4 weeks and should gradually decrease and go away. However, if the pain persists during or after sexual intercourse, it could be due to improper positioning of the IUD or its strings. If you experience fever, heavy bleeding, or excessive vaginal discharge, it is important to see your doctor. They may need to reexamine the positioning of the IUD to ensure it is properly placed.