The vast majority of first pregnancies are not biochemical, and so far the cause of biochemical pregnancy is not known. When the menstrual period comes, there is a small amount of vaginal bleeding, and after laboratory tests, the blood HCG is often elevated and then decreases, most likely due to a biochemical pregnancy. The majority of first pregnancies are normal intrauterine pregnancies, and if the pregnancy continues, most of them will be full term without any special circumstances, so there is nothing to worry about. It is best to plan your first pregnancy, which means that you should have a health checkup before you get ready to get pregnant to understand the basic health condition of your body, both men and women should be checked before you consider getting pregnant and take oral folic acid tablets before you get ready to get pregnant to prevent fetal neural tube abnormalities.