How many nodules? How big are they? Did your doctor tell you the likelihood of these nodules being cancer? Did you have these nodules on the previous lung CT scans?
Since you have COPD, it is hard to say whether these nodules are caused by the COPD or something bad. The lung CT scan would provide some helpful information. If the likelihood of cancer is moderate to high, your doctor may ask you to repeat the CT scan 3-6 months later or refer you to a thoracic surgeon.