Hi. I Went To An Urgent Care Late Last Week

Hi. I went to an urgent care late last week with complaints of cough for close to 3 weeks. They did a chest scan, which the dr said looked fine. Sent me home with a zpack just in case some sort of infection was going on. 5 days later I feel better but am still coughing. Got a call today from urgent care saying a density was seen over the lower left portion of my lung. She said it could be my rib, or a bone lesion. They want me to go back in 2-3 weeks for another chest scan. Routine follow up or should I be nervous?