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PTB means pulmonary tuberculosis
. Undetermined activity on chest x-ray means it is doubtful whether disease activity is going on or it's just a shadow of healed lesion. Clinical correlation means looking for the symptoms in the patient like cough
of any type, bloody sputum, loss of weight, evening rise of temperature, night sweats
etc. Bacterial correlation means demonstrating bacteria on sputum microscopy.
Usually the right upper lung field lesions are due to tuberculosis. You may go for sputum microscopy at any designated microscopy centre free of cost.
Your doctor has started the treatment empirically and the effect can be noticed after 15 days or 1 months of treatment as increased body weight, improvement in symptoms, xray resolution of the lesion etc..
Don't be panic, continue the treatment. At the same time you can go for sputum for microscopy for bacterial confirmation.