Had the same thing happen to me years ago, doc said "its either an infection or lung cancer." They put me on antibiotics for 2 weeks and told me to come back for more xrays. If it shrank, it was an infection, if it didn't it could be possibly cancer. I went 2 weeks thinking I was dying only to find out that it was mild pneumonia. It could be anything at this point. Relax, pray, be cool, and wait for the results. Good luck!