Blood in the urine in pregnancy can be caused by a urinary tract infection, and it is always advisable to check whether it is vaginal or urethral bleeding. Vaginal bleeding is suspected to have the possibility of miscarriage, while urethral bleeding is likely to be an infection. Urethral bleeding should also be taken seriously enough to first rule out the possibility of urinary tract tumors. It is recommended that ultrasound examinations of the kidneys, ureter and bladder must be done, and ultrasound examinations can also detect the presence of urinary tract stones. The most common cause of blood in urine after pregnancy is urinary tract infection with red and white blood cells in urine routine. If the inflammation is heavy, you can consider taking cephalosporin-based anti-inflammatory drugs.