As I see your report here your IgM Antibody level shows sign of infection but it could not be only Tuberculosis
in this case. this may be a common respiratory tract
your doubt for tuberculosis can only be conformed by following investigations..
1) Sputum Acid fast staining (at least for 3 days)
2) radiological examination of Chest (X-Ray)
otherwise the IgM level can be positive any other case of infection & even in case of Hospital exposer.