Hi there, If you are having sharp lower stomach pains and you have had unprotected intercourse, I would advise you to get yourself to an emergency room to rule out an ectopic pregnancy. This can happen early enough that the urine pregnancy test can t detect it yet. They will be able to do an ultrasound to confirm this, and yes, that will also show if your intrauterine contraceptive device (IUCD) has moved. The reason I am worried is because an ectopic pregnancy, which is when the pregnancy implants outside the womb, causes internal bleeding and can be dangerous if left to progress. Sometimes a urine infection can also cause similar pain, but the pain score is usually much lower, and you might have burning sensation when you pee, or need to pee more often. No contraception is 100% effective. Even if the IUCD hasn t moved there is a small risk of pregnancy, and if you do get pregnant with an IUCD intact, the chances of it being ectopic is higher. If the IUCD has moved, then your risk of getting pregnant has increased tremendously. Feel for the string of the IUD in your vagina, if you are unable to find it then it is possible that it has been dislodged. Some people do not notice it even after it has been completely expelled. If it is partially dislodged you need to remove it, because it does not serve its function anymore where it is, and will probably cause you continued discomfort. Hope this helps, and all the best to you. Regards, Dr. Teh