A negative test result with pregnancy test paper 4 weeks after a 3-generation IVF transfer is usually credible, and it is recommended to go to the hospital in time for further testing. Regardless of how many generations of in vitro test to detect pregnancy, blood test is conducted 2 weeks after embryo transfer, and patients can also conduct urine test at home by themselves. Before embryo transfer, 3 generations of IVF will conduct chromosomal genetic testing on the polar body cells of the embryo, and only healthy embryos will be transferred back into the body. If a pregnancy is detected 2 weeks after the transfer, it is a pregnancy, and if no pregnancy is detected, it is not a pregnancy. Since high doses of progesterone will continue to be taken after the IVF transfer to support the luteal function. Therefore, you will not have a period until you stop taking the pill, and a blood test for HCG can be taken to confirm pregnancy. In addition, urine test results are not as accurate and sensitive as blood test results, but if the results are negative for 4 weeks, the possibility of non-pregnancy should be considered.