Bleeding during intercourse during pregnancy may be related to factors such as pre-miscarriage or preterm labor, cervical bleeding and vaginitis. 1. Pre-eclampsia or preterm labor: If a pregnant woman has more bleeding after intercourse, accompanied by lower abdomen and lumbar-sacral drop and pain discomfort, it is considered to be due to the coitus, do not have a good grasp of the strength of the overstimulation and lead to miscarriage or preterm labor symptoms, it is recommended that pregnant women timely medical ultrasound examination, to clarify the condition of the targeted treatment. 2. Cervical bleeding: During pregnancy, the cervix of pregnant women is in a congested state, and excessive stimulation during intercourse can easily cause bleeding on the surface of the cervix. If the pregnant woman does not have abdominal pain and the bleeding is relatively small, there is no special treatment, just pay attention to observation. 3. Vaginitis: Because pregnant women have poor resistance during pregnancy, it is easy to cause gynecological inflammation, such as vaginitis, etc. Vaginitis can lead to congestion and edema of the vaginal mucosa, and some patients may have superficial ulcers and ulcers, which may lead to bleeding after intercourse. In addition, cervical erosion, cervical polyps and other diseases may also cause bleeding after intercourse, it is recommended that pregnant women consult a doctor in time to check, clear the cause of the targeted treatment, pay attention to keep the private parts clean in life, abstain from sex, and regular maternity check.