Changes may have occurred in your cervix since your last screening test. Such changes can progress to cancer if left untreated. Very rarely, you may have a cancer that was not detected at your last screening test. If you notice any symptoms that worry you, especially bleeding during sexual intercourse, or other symptoms such as unusual vaginal bleeding after menopause or between regular menstrual periods, you should consult your doctor and not wait until your next screening invitation. Screening has a high protective effect against cervical cancer, but this protection is not complete.