Dark-colored mucus during the seventh month of pregnancy can be a cause for concern. It may indicate various issues such as vaginal bleeding, infection, or cervical changes. It is important to consult with a healthcare provider to determine the underlying cause and receive appropriate treatment. They may perform tests, such as a pelvic exam or ultrasound, to evaluate your condition. Depending on the diagnosis, they may recommend rest, medication, or other interventions to ensure a healthy pregnancy outcome.