In a study of women who became pregnant while using an IUD, researchers found that the device was in the wrong position in more than half of the cases. "Gynecologists typically do a pelvic and speculum exam after placing an IUD, but there's no sonogram involved," said lead author Dr. Elysia Moschos. The researchers said the failure rate could be reduced if doctors checked the IUD's position using a sonogram after insertion, and during annual exams.