What could be the reason for slight bleeding after intercourse during the third month of pregnancy?

In general, "sexual intercourse" refers to sexual activity. Light bleeding after sexual intercourse during the third month of pregnancy may be related to factors such as placenta previa, placental abruption, cervicitis, cervical polyps, or uterine fibroids. If any discomfort occurs, it is recommended to seek medical attention promptly and receive symptomatic treatment under a doctor's guidance. Specific analyses are as follows:

1. Placenta Previa

In cases of placenta previa, the placenta attaches to the lower segment of the uterus and may even cover the cervical opening. Sexual intercourse might touch the edge of the placenta, causing bleeding. It is recommended to rest in bed; hospitalization for observation may be necessary when needed, and sexual intercourse should be avoided.

2. Placental Abruption

Placental abruption refers to the separation of the placenta from the uterine wall, leading to bleeding. Mild placental abruption may not be accompanied by severe abdominal pain. Immediate medical attention is required. Management depends on the degree of placental detachment—mild cases may recover with bed rest, while severe cases require emergency cesarean delivery.

3. Cervicitis

Due to hormonal changes in early pregnancy, the cervix becomes more susceptible to infection, which can lead to inflammation. The cervical tissue may become more fragile, and minor friction during sexual intercourse could result in bleeding. However, if the infection does not extend into the uterus, abdominal pain may not occur. Symptoms may include increased vaginal discharge, unusual odor, or abnormal color. Under medical guidance, medications such as Azithromycin Capsules, Jingteng Capsules (Tengguangteng), or Minocycline Hydrochloride Capsules may be used to relieve symptoms.

4. Cervical Polyps

Chronic inflammation or cervical infections may trigger cervical polyps. These polyps have rich surface blood vessels and fragile tissue; contact during sexual intercourse in early pregnancy may cause them to rupture and bleed, although pain may not be obvious. Besides bleeding, there may be no significant discomfort, or only mild lower abdominal pressure. Under medical guidance, medications such as Amoxicillin Capsules, Ibuprofen Sustained-Release Tablets, or Celecoxib Capsules may be used to alleviate symptoms.

5. Uterine Fibroids

Uterine fibroids may be associated with genetic predisposition, sex hormone levels, and stem cell dysfunction. During sexual intercourse in early pregnancy, fibroids may compress the endometrium or their surface blood vessels may rupture, causing bleeding. Symptoms may include urinary frequency or constipation due to compression. Treatment may include medications such as Guizhi Fuling Capsules, Hongjin Xiaojie Capsules, or Danbie Capsules, as directed by a physician.

Any episode of vaginal bleeding after sexual intercourse in early pregnancy should prompt immediate medical evaluation. Furthermore, to ensure maternal and fetal health, it is advisable to avoid strenuous exercise and sexual activity during pregnancy, and to maintain a healthy lifestyle that includes balanced nutrition, adequate rest, and regular prenatal checkups.