I had lung nodule found on ct of abdomen. they r going to do full ct. i recently had clean x-ray of chest. what should i think?

It depends on: the characteristics of the nodule and your risk profile. If you are at low risk(i.e. a nonsmoker), and the nodule is a small smooth rounded incidental nodule, likely it will mean follow up at 6 or 12 months for a couple of years to confirm stability, since the vast majority of these are benign. If it is large and irregular in shape, and you are at higher risk, it becomes more suspicious.