Is it possible to be clinically diagnosed with TB disease but latent?

Hi 21(F). During ng pre-emp medical, they saw an anomaly in my upper lung and they suspected it as TB. To confirm, they made me do a sputum test and the result was negative: MTB not detected. The doctor told me that in this case I have inactive TB but still need to undergo 6 months TB treatment. My files state that I have PTB - Clinically diagnosed and I asked the doctor if this is the term if the patient has inactive TB and she told me yes. She also mentioned that I just need to take 1 week of antibiotic and she will give me a fit to work clearance. Do anyone have the same case with me?