A small amount of bleeding in the 30th week of pregnancy needs to be examined in time and treated with medication under doctor’s supervision for birth control. Under normal circumstances there should not be vaginal bleeding before 37 weeks of pregnancy. Now 30 weeks pregnant, the fetus has not yet matured, a small amount of vaginal bleeding, you need to go to the hospital in time to check, because it is possible that preterm labor has occurred. If preterm labor occurs, the pregnant woman will not only experience a small amount of vaginal bleeding, but also irregular uterine contractions, which may cause discomfort such as stomach pain or back pain. If it is determined to be preterm labor, it is necessary to use medication under the guidance of the doctor to preserve the fetus, such as magnesium sulfate or ritodrine hydrochloride can be injected intravenously, and so on. During the period of fetal preservation, pregnant women should pay attention to bed rest, and closely observe the fetal movement. Pay attention to eat more crude fiber food to prevent constipation.