The leucorrhea of pregnant women will appear more than usual, which is caused by the rise of hormone levels in the body. But if the sudden increase in leucorrhea is mainly due to the following two reasons: First, pregnant women have vaginitis, vaginitis can easily lead to increased leucorrhea, some will also be accompanied by odor, vaginal itching, vulvar discomfort, etc. It is recommended to go to the hospital as soon as possible to improve the leucorrhea examination, according to the examination results for corresponding treatment. Second, seen in premature rupture of fetal membranes, some are high level rupture of membranes outflow of very little amniotic fluid, pregnant women will think it is increased leucorrhea, but in fact it is amniotic fluid outflow, in the case of increased leucorrhea without odor, must go to the hospital for examination, so that the doctor to rule out whether there is premature rupture of fetal membranes.