Thanks for coming to HCM
TB gold test OR IGRA is a good test to detect latent TB..Its sensitivity is good...
TB treatment is taken either for a full course i.e for 6 months if TB is detected or suspected...as per guidelines both WHO and RNTCP there is no recommendation like taking treatment for 3 months..
You may go for chest xray USG abdomen, endometrial biosy etc to look for active TB
if you are over enthusiastic or otherwise I don't think you require ATT..