The thirtieth day after frozen embryo transfer is equivalent to about day 47 or 49 of natural conception, or about 7 weeks of pregnancy. Frozen embryo transfer is a process in which the embryos that have been cultured to day 3 or 5 after egg retrieval are frozen and sealed, and then thawed at a later date before being placed in the human body. The gestational week is usually calculated from the first day of the last menstrual period. If the embryos transferred are day 3 embryos, the date of transfer is generally pushed forward 17 days, and the resulting date is taken as the first day of the last menstrual period, and the 30th day of transfer is equivalent to the 47th day of natural conception, which is about 7 weeks of pregnancy. In the case of a 5-day blastocyst transfer, the date of transfer can be pushed forward 19 days to calculate the first day of the last menstrual period, and the 30th day of transfer is equivalent to the 49th day of natural conception, which is also about 7 weeks of pregnancy. Estimating the week of pregnancy according to the time of the last menstrual period is only a rough estimate of the time, and the specific week of pregnancy needs to be determined by ultrasound. After the frozen embryo transfer, you should pay attention to rest and go to the hospital regularly for maternity checkups.