Bleeding after intercourse in the first month of pregnancy may be associated with miscarriage, cervical lesions and other causes, which should be taken seriously in time. 1. Pre-eclampsia: Bleeding after intercourse in the first month of pregnancy may be associated with pre-eclampsia, which is associated with greater stimulation of the uterus. 2. Cervical inflammation: bleeding after intercourse in the first month of pregnancy may also be associated with cervical lesions, such as cervical polyps, cervicitis, etc., due to the role of inflammatory factors in the body, which will cause greater stimulation, and then bleeding symptoms. Bleeding after intercourse in the first month of pregnancy may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.