If you have a normal period, you can’t get two bars on a pregnancy test if you take it before your period. Normal menstruation is formed after ovulation, if the egg is not fertilized, that is, not pregnant, then the uterine lining will be “discarded”, ruptured pieces of the uterine lining and blood together with the discharge of the body, the formation of menstruation. If you have a normal period, you won’t be able to detect pregnancy, but if you’re pregnant, you won’t be able to have a normal period. In reality, there are some people who mistake abnormal bleeding as a period. In fact, there may be pregnancy caused by preeclampsia, biochemical pregnancy, ectopic pregnancy and so on. Therefore, two bars are not usually detected before a period, and if the time and amount of bleeding is different from the usual period, it is recommended to go to the hospital to rule out other problems.