There are many causes of pregnancy bleeding and inflammation can be one of the causes of pregnancy bleeding.
Inflammatory factors such as cervicitis and endometritis can lead to vaginal bleeding during pregnancy.
Acute cervicitis, for example, presents with increased vaginal discharge, bleeding or with urinary tract infection. The secretions are mucopurulent in nature. The presence of inflammation can be determined by examination of vaginal discharge and white blood cell count, and the presence of pathogenic infection can be determined by pathogen testing.