Day 3 frozen embryo transfers will most often detect pregnancy around 10-14 days after the transfer. Generally, day 3 frozen embryos are equivalent to zygote stage embryos, and most of them will have increased levels of human chorionic gonadotropin (HCG) around 10-14 days after the transfer, which in turn can be detected by using early pregnancy tests or blood tests to check for HCG to determine whether or not they are pregnant. It is recommended to use morning urine when testing with pregnancy test strips and not to drink too much water before the test to avoid affecting the test results. The use of pregnancy test paper for testing there is a certain degree of error, it is recommended that a blood test of human chorionic gonadotropin to determine whether or not the pregnancy, and for pregnant people need to be rechecked every other day, if there is a doubling of human chorionic gonadotropin in good condition, it is mostly suggestive of a good state of the embryo.