Premenstrual false (+) is to menstruation before the early pregnancy test is (+) results, followed by the phenomenon of vaginal bleeding, then this bleeding is not a normal menstruation but a sign of miscarriage. Then the most common clinical is caused by biochemical pregnancy, biochemical pregnancy is that the fertilized egg will be discharged with the vaginal bleeding outside of the vagina, often ignored the possibility of pregnancy and thought to be menstruation. Therefore, if you have ever taken an early pregnancy test before menstruation, there will be a (+) result, and this (+) result is not the false (+), but is indeed pregnant, but it is a biochemical pregnancy, along with the bleeding and discharged out of the body, the clinic often ignores this kind of pregnancy. It is recommended that if you notice a low menstrual flow or irregular vaginal bleeding when you are about to have your period, you should have an HCG test.