Usually, there is little point in preserving a biochemical pregnancy and therefore it cannot be preserved. A biochemical pregnancy, also known as a cryptic abortion, is one in which the sperm and egg successfully unite after intercourse to form a fertilized egg, but are unable to enter the endometrium to grow and develop, and instead flow out of the body with vaginal bleeding. In general, fertility preservation should ensure that there is a gestational sac in the uterine cavity and that the size of the gestational sac is more than 1 cm, and that a yolk sac is present, in which case fertility preservation can be performed. In the case of biochemical pregnancy, there is no embryo or gestational sac in the uterus, so there is no way to perform targeted fertility preservation. Chromosomal abnormalities in the embryo, poor sperm quality, and diminished ovarian function can all lead to a biochemical pregnancy. Therefore, couples can be tested for eugenic aspects before preparing for pregnancy to prevent biochemical pregnancies. If a patient has a biochemical pregnancy, he or she can take 3-6 months off after the abortion before preparing for pregnancy, pay attention to proper rest, and enhance nutrition in the diet to ensure the formation of quality embryos.