Occult blood in urine test of pregnant women is considered to be related to strenuous exercise, urinary tract infection, ureteral stone, aplastic anemia and so on. 1. strenuous exercise: when some pregnant women after strenuous exercise, may appear urine test occult blood phenomenon. 2. Urinary tract infection: the disease is mainly related to pathogenic microbial infection, decreased immunity, structural urethral obstruction and other predisposing factors. When pregnant women with urinary tract infection, can be manifested as frequent urination, urinary urgency, urinary pain, hematuria, etc., medical urine test can also see occult blood. 3. Ureteral stones: when ureteral stones cause irritation and damage to the local mucosa, it is easy to cause occult blood in urine test. Ureteral stones are associated with metabolic abnormalities, urinary tract obstruction, infection, etc., and are easily accompanied by other symptoms such as low back pain, urinary frequency, urgency, and painful urination. It is recommended that pregnant women with occult blood in the urine test undergo further detailed examination in order to clarify the cause of the disease and then follow the doctor’s instructions for treatment, so as to minimize the impact on themselves and their fetuses.