There are many reasons for a weakly positive urobilinogen in pregnant women, and usually, but less frequently, urobilinogen can be found in the urine. Urobilinogen, known as urobilinogen, refers to the destruction of red blood cells to produce non-conjugated bilirubin, which is transformed into conjugated bilirubin in the liver, and then into the intestine, under the action of bacteria to form bilirubinogen, which then enters the liver through the hepatic portal vein, forming the hepatic-intestinal circulation, part of which is excreted in the urine, that is, urobilinogen. Weak positive urobilinogen is mostly seen in the following cases: 1, under normal circumstances: such as after meals; 2, hemolytic jaundice or other hemolytic diseases: leading to increased bilirubin excretion, which is converted into urobilinogen in the intestine, and excessive urobilinogen is excreted from the kidneys, which is positive or weakly positive; 3, liver diseases: the absorption of urobilinogen is impaired, which can also lead to excessive urobilinogen excretion from the urine, resulting in urobilinogen Weakly positive; 4, constipation, cardiac insufficiency, serious burns, can also lead to weakly positive urobilinogen. If there are no obvious abnormal symptoms, usually pay more attention to rest and drink more water. A weak positive urobilinogen alone can be a cause for no concern and can be reviewed regularly. If patients have abnormal symptoms, they need to seek medical attention for relevant treatment.