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While cramping and unusual bleeding patterns can occur if an IUD moves, cramping and heavy spotting can more often occur as a side effect to the presence of the IUD. Less common, the symptoms may be due to an infection, although there are frequently other symptoms present, such as fever or pain with intercourse. The symptoms, by themselves, are not able to say whether the IUD has moved or something else is the cause, but statistically, it is more likely that the symptoms are a side effect without the IUD moving or another problem present.
However, even if the IUD has not moved, the development of significant cramping or heavy bleeding may be of such severity that it is necessary to remove the IUD.
At this point, the severity of symptoms would guide the next step. If the symptoms are less severe and tolerable, then it is OK to give it some time to assess the overall pattern of symptoms. But if the symptoms are more severe or intolerable, then the next step would be seeing your doctor for a physical exam.
If I can provide any additional information, please let me know.