If the first time you take a pregnancy test, there are two red lines, and the second time you take the test, there is often one red line, the most common reason for this is the possibility of a biochemical pregnancy. In a biochemical pregnancy there is a rise in HCG levels, but then there is a drop, which is characteristic of biochemical pregnancies. It is best to draw blood to check the blood HCG, and a clinical diagnosis of a biochemical pregnancy can be made by observing that the blood HCG continues to fall. After a biochemical pregnancy, you should pay attention to proper rest, and it is also recommended that you should not have sexual intercourse for one month. Because after a biochemical pregnancy, the body’s indicators have changed accordingly, and it will take some time to return to a non-pregnant state. It is also recommended to keep the vulva clean and change sanitary napkins regularly if there is vaginal bleeding.