The redness in the fourth month of pregnancy may be caused by miscarriage, low position of the placenta, cervical lesions and other reasons.
1. Pre-eclampsia: The redness of the fourth month of pregnancy may be due to the low level of progesterone in the body of the pregnant woman, resulting in pre-eclampsia, causing a small amount of vaginal bleeding.
2. Placenta position is too low: four months pregnant due to the low position of the placenta is prone to abdominal exertion, sexual stimulation after the occurrence of abnormal vaginal bleeding, usually no obvious abdominal pain.
3. Cervical lesions: when the pregnancy is combined with cervical lesions, such as cervicitis, cervical polyps, cervical cancer, etc., vaginal bleeding can occur after sex due to damage to the cervical mucosa.
If you are pregnant, you should go to the hospital in time to complete the examination and give targeted treatment after clarifying the cause of the disease.