Bleeding after coitus during pregnancy without stomach pain may be due to rough behavior to vaginal injury, low placenta position, cervical disease: 1, rough behavior to vaginal injury: if coitus is too violent, it is easy to lead to vaginal mucous membrane damage, bleeding phenomenon, at this time you should stop having sex, bed rest. Early pregnancy and late pregnancy is not recommended coitus, mid-pregnancy coitus should pay attention to gentle movements, avoid pressure on the abdomen; 2, placenta position is too low: placenta praevia patients in coitus can lead to placental detachment, causing bleeding, this time is usually not accompanied by abdominal pain. However, if the amount of bleeding is relatively large, it is easy to lead to hemorrhagic shock, and even cause fetal death; 3, cervical disease: if there are cervical lesions, such as cervical polyps, cervical cancer and other related diseases, it may cause cervical contact bleeding, which needs to be clearly diagnosed, and treated under the guidance of professional obstetricians and gynecologists. After bleeding symptoms are detected during pregnancy, you should try to rest in bed and avoid strenuous activities, and at the same time, you should pay attention to observing the nature and amount of bleeding. If there is persistent bleeding accompanied by abdominal pain symptoms, it is necessary to consult a doctor in time to clarify the diagnosis, and then carry out symptomatic treatment, so as to avoid delaying the condition leading to intrauterine hypoxia, asphyxia and other adverse consequences of the fetus.