PCR is widely used in clinical laboratories to diagnose pulmonary, extra-pulmonary, and disseminated tuberculosis
As your TBPCR is positive, means you have extra-pulmonary T.B [ genital-uterine TB]. In this case , you have to take complete anti-TB treatment. After treatment you can conceive.
Genital TB increase chances of miscarriage
in women. Your miscarriage can be because of that.
So consult physician as early as possible and get treated for TB; then conceive.