The quality of 7-day blastocysts is generally not poor. A 7-day blastocyst is a blastocyst that is being raised, that is, the fertilized egg is being cultured in the laboratory. Starting from the 1st day of culture, the fertilized egg will continue to divide, and by the 3rd day it will have divided into about 5-10 cells, and by the 5th-6th day of culture it will have divided into more than 100 cells, and by this time a blastocyst has been formed. Better developed blastocysts are more suitable for human physiology. The better the development of blastocysts, the higher the success rate of implantation and the lower the incidence of ectopic pregnancy. However, not all blastocysts that are transferred into the uterus will successfully implant, it depends on the woman’s physical condition, and a few women’s bodies do not fully meet the criteria for implantation, which can lead to implantation failure. Artificial insemination is a more complicated method of conception, you should choose a regular and qualified hospital, and keep a good state of mind, do not be overly nervous.