Back pain on the third day after blastocyst implantation cannot indicate implantation, which has no scientific basis, and back pain can also be caused by lumbar spine disease, pelvic vein congestion and varicose and other reasons. Blastocyst transfer is to culture the fertilized egg of artificial insemination in vitro for several days, and then implant it into the uterine cavity after cell division and proliferation to a certain number. It is not possible to tell whether the blastocyst is implanted or not on the third day after the blastocyst implantation, and the back pain may be caused by the existence of lumbar spine disease, pelvic vein congestion and varicose, etc., and it is not possible to tell whether the implantation is successful or not. After blastocyst transfer, you have to go to the hospital and pass the relevant examinations, such as blood test HCG, B ultrasound, etc., to be able to judge whether the implantation of blastocyst is successful or not, after the implantation is successful, women’s menstruation will be suspended and not come, and if the implantation is not successful, the menstruation will come on schedule in general. Relax your mind after blastocyst transfer, try not to be too nervous and too much psychological pressure.