Thank you for your query,
After treating primary complex with antitubercular drugs for 6 months, the scar will not be visible on X rays.
X-ray doesnt show any scar, but it can show any pleural fluid and consolidation if they present.
If there is any calcification in the lungs, it will be visible on x rays.
Continue the medication as advised by your Pediatrician
and be in regular follow up to monitor the response.
Hope I have answered your query.