You are usually not pregnant when you have your period, but it is best to take an HCG test to be sure. Menopause is an important indicator of possible pregnancy. If a period comes, it usually means that the egg is not fertilized, the ovarian corpus luteum undergoes atrophy, sex hormone levels drop, and the uterine lining loses the support of sex hormones and sheds blood. So if a normal period comes, it usually means there is no pregnancy. However, it should be noted that preeclampsia, difficult to avoid miscarriage or incomplete abortion, ectopic pregnancy can also occur vaginal bleeding phenomenon, some women may think that it is the menstrual flow, suspected of pregnancy is best to test urine or blood HCG to determine. Women of childbearing age who have had unprotected sex should be aware of the possibility of pregnancy, whether or not there is vaginal bleeding.