Biochemical is also biochemical pregnancy, David test paper deepening slow may be biochemical, but through the test paper deepening slow can not diagnose biochemical pregnancy, early pregnancy test paper deepening slow may also be test paper failure, test method error and other reasons. The slow deepening of the early pregnancy test paper indicates that the human chorionic gonadotropin in the body rises slowly, which may be caused by the poor quality of the embryo, biochemical pregnancy, ectopic pregnancy, etc. Whether or not the biochemical pregnancy should be diagnosed through the examination in the hospital. If a woman is pregnant and can’t see the gestational sac on ultrasound, and the HCG value gradually decreases with vaginal bleeding, she can be diagnosed as having a biochemical pregnancy, which means that the fertilized egg is aborted before it can reach the uterine cavity and settle down. The slow deepening of the pregnancy test paper can not diagnose a woman with a biochemical pregnancy, the test paper has passed the expiration date or the test method is wrong, there may also be a test process is the manifestation of the slow deepening of the test paper. After pregnancy suspected biochemical pregnancy, it is recommended to go to the hospital to check the judgment.