Nine days after intercourse, if you have a normal period, you are not pregnant. If there is an abnormal menstrual period, which is abnormal bleeding from the uterus, it may be related to pregnancy. Pregnancy is not followed by menstrual periods or vaginal bleeding. However, in cases of miscarriage, miscarriage or ectopic pregnancy, even pregnancy may have vaginal bleeding symptoms, so many women mistake this vaginal bleeding for menstrual flow. You can observe this abnormal vaginal bleeding, which is different from regular menstrual flow. Usually there is a history of menopause before vaginal bleeding, and usually the bleeding is small in amount and lasts for a long time. If you want to know if you are pregnant as soon as possible, you can buy pregnancy test strips to test your urine or take a blood test for HCG, and if the results of both pregnancy tests are negative, it proves that you are not pregnant.