If there is blood in the leucorrhea at 39 weeks of pregnancy, first of all, it is considered to be a sign of preterm labor caused by redness. It is recommended to go to the hospital for examination and, if necessary, to be hospitalized for delivery, while measuring blood pressure to see if there is placental abruption. If the pregnant woman has cervical lesions or vaginitis at 39 weeks of pregnancy, the above symptoms may also occur. 1. aura of labor: 39 weeks of pregnancy is close to the due date, and the pregnant woman may be in labor at any time. if there is blood in the leucorrhoea, it may be an aura of labor. First of all, you need to do an internal examination, pay attention to whether the opening of the uterus has been opened, if the cervical opening has been opened, you should be hospitalized in time for delivery. Secondly, fetal heart monitoring is needed to determine the frequency, intensity and duration of contractions and to observe the fetal heart condition. If there are regular contractions, the pregnant woman may deliver within 24 hours. If there are no irregular contractions, it means that the labor has not yet entered, so you can closely observe and pay attention to the changes of fetal movement and vaginal bleeding; 2. Placental abruption: If the vaginal bleeding of pregnant women at 39 weeks increases, such as the amount of menstruation, accompanied by blood in the leucorrhoea, while the blood pressure may be >140/90mmHg, consider it an abnormal situation, and check whether there is placental abruption. Placenta abruption often occurs in pregnant women with combined gestational hypertension or chronic nephritis, so pay attention to ultrasound examinations to observe whether the placenta has abnormal thickening, and patients with placenta abruption may also have symptoms such as abdominal distension and abdominal pain; 3, gynecological diseases: you need to pay attention to whether the pregnant woman has cervical-related diseases, some pregnant women have cervical polyps or submucosal fibroids, which can also cause blood in the leucorrhea Some pregnant women have cervical polyps or submucous fibroids, which can also cause blood in the leucorrhea. You can do an internal examination and pay attention to whether there are any abnormalities on the surface of the cervix. In addition, some pregnant women may have vaginitis, which may also cause blood in the leukorrhea.