Do you know if pneumonitis can lead to ptb?

Yes, it can't. Pneumonia caused by viruses or bacteria cannot lead to tuberculosis. Tb can cause tuberculosis pneumonia.
No. Pneumonitis is any type of inflammation in the lungs. But pulmonary tuberculosis (which i'm assuming you refer to as ptb) can present as pneumonitis. Please see your doctor to get appropriate tests done for ruling out pulmonary tuberculosis.