dear user these symptoms may be with the period commonly as hormonal changes of your body cause contraction of uterus and cause lower abdominal cramps and brownish discharge may accompaign the period also at the end of time of it but also these symptoms may indicate urinary tract infection.......following simple investigation will reveal the causative organism if present.... you need to do urine culture as simple investigative test of bacterial infection and in if diagnosed infection you should have antibiotics for treatment ........also doing blood culture will be helpful......discuss with your doctor to do urine culture as it will help alot.......you should not be worried of that and drink alot of fluids wish you healthy life