hi i am suffering from miliary tubercluosis of lungs. some parts of my liver is also afftected eith the same bacteria. also i have brain tubercloma. my medications are: pza, combutol, streptomycin , r-cinex, wysolone. my menustrual cucle was supposed to start on 2 of july but its 22 july, no periods still. i am not pregnent. what can be the cause of delayed periods?