Presence of RBC in urine can be due to Urinary track Infection, Renal calculi
, Bladder cancer
or due to the medications.
A simple Sonography and X-ray KUB can help you to find out the cause. If causes not cleared in sonography CT scan may be needed. Consult your urologist
to find out the cause and do investigations. Till that drink plenty of water, take alkalizer like citrus soda, and a course of antibiotic.