During pregnancy with tuberculosis, there is 9 months course of isoniazide H , rifampicin R, ethambutol E. Streptomycin and pyrazinamide can not be given because they can cause birth defects. During treatment patient should have vit b6 pyridoxine. If not treated or bacteria didnt clear with this course then one may have to extend the course. These drugs dont harm even in breastfeeding as its trace amount is secreted in breast milk. So can contnue your pregnancy and take advise of pulmonoligst also.