Jelly-like discharge at 39 weeks of pregnancy may be caused by cervical mucus plug, preterm labor, vaginitis or cervicitis. 1. Cervical mucus plug: 39 weeks of pregnancy belongs to the end of pregnancy, the uterus is obviously enlarged, which may lead to cervical mucus plug discharged from the cervical opening, which may cause jelly-like discharge, and it may be a normal manifestation. 2. Pre-eclampsia: At 39 weeks of pregnancy, if a pregnant woman shows signs of impending labor, there may be a small amount of vaginal bleeding, blood mixed with vaginal secretions discharged. During the descent of the fetal head and dilatation of the cervix, there may be jelly-like discharge. 3. Vaginitis or cervicitis: If a pregnant woman in her 39th week of pregnancy develops vaginitis or cervicitis, the vagina and the cervix increase in inflammatory exudate, and then there may be discharge of jelly-like secretions. Jelly-like discharge at 39 weeks of pregnancy, you need to go to the public hospital obstetrics and gynecology consultation, according to the cause of the treatment under the guidance of the doctor.