Hi, Thanks for writing in. You might be having urinary infection and this is confirmed by presence of E coli bacteria in your urine sample. You have done the right thing by getting urine culture and sensitivity test done and started taking nitrofurantoin since yesterday. This medication acts on the bacteria and should be taken for a short course without breaks for 5 days to kill the bacteria. The medication requires at least 2 days for you to start feeling better which happens when the bacterial count starts reducing after taking the medication. The slight kidney pain might be due to urinary infection itself. You can continue taking medications as prescribed and also drink plenty of juices and fresh fluids. Please do not hold urine and visit washrooms regularly. Also you should be careful in toilet seats in public toilets before using it. If your pain increases in severity in the next few days and gets more localized near the kidney area then getting an ultrasound scan is suggested.