25week pregnancy-lower back pain. How.

I was diagnosed with urine infection, bleeding and pre labor last 24week i undergone medication ciplox-500mg, ceftum250mg, susten, duvadilan, cital, urispas today morning after meals my antibiotic medication is completed... but yesterday i got clear to white say egg white sticky discharge which is greenpea size and still im Im having lower back pain and pubic bone pain Day by day im worrying with this problem please clear my doubt like getting lower back pain is common or something serious in which case i should call my doctor... how to manage hygienity to avoid urine infection? Im using drops of dettol in one mug to clean toilet seat before i use... for bathing also k use few drops of dettol, cleaning my inners with drops of dettol along with detergent , every time i pee i wash with lukewarm water what else should i do to get rid of infection ? Im done with thinking and googling all of these... if i trim or shave my pubic hairs it will reduce or how... please anyone help me out