The test paper not deepening on 8-11 days of blastocyst transfer may be caused by the test being too early, or a failed transfer. If the test paper is not deepened in 8-11 days of blastocyst transfer, it may be that the test time is still too early, the concentration of human chorionic gonadotropin in urine is not high yet, and the test result is not positive for the time being. However, if the test is not positive, you don’t need to be too anxious, you need to observe for a few more days and then review the test, and then take the morning urine test again after 3~5 days, if the test result still doesn’t deepen, you can consider that the transplantation has failed. Try to choose morning urine, the concentration of human chorionic gonadotropin in morning urine is higher, and the test result is more accurate.