If you are experiencing prolonged or heavy bleeding along with painful cramps while using an intrauterine device (IUD), it is recommended to consult with a healthcare provider. Persistent or worsening bleeding for more than two weeks may indicate an issue that requires medical attention. Additionally, anti-inflammatory medications such as Advil may help alleviate menstrual cramps and reduce bleeding, but it is important to confirm the safety of this option with a pharmacist.