In women who have intercourse without contraception, the sperm may enter the body and unite with the egg to form a fertilized egg. If the fertilized egg does not successfully implant in the uterine cavity, it is naturally expelled and is called a biochemical pregnancy, and there is no way to induce a biochemical pregnancy. After union, the fertilized egg is not influenced by other external factors and will choose whether to implant or not depending on the environment of the uterine cavity. As long as the woman’s uterine cavity is normal, the fertilized egg may naturally implant and lead to successful conception, even though there may be no way to induce a biochemical pregnancy by taking blood-boosting drugs or strenuous exercise at this time. For women who do not want to have children, they should take appropriate contraceptive measures during intercourse, or take emergency contraceptive pills after intercourse to avoid unwanted pregnancy.