The main examination 28 days after IVF transplantation includes ultrasound, progesterone, chorionic gonadotropin and so on. 1. Ultrasound: 28 days after IVF transplantation, the main examination is to do ultrasound, to observe whether the gestational sac is deposited in the uterus, to rule out ectopic pregnancy, and in addition to check whether there is a yolk sac fetal heart and bud development, so as to rule out the possibility of embryonic stagnation. 2. Progesterone: Progesterone is a hormone that is important in maintaining the safe development of the fetus during pregnancy. It is necessary to take a blood test, and if it is low, it can be supplemented in time to prevent preeclampsia. 3. Chorionic gonadotropin: chorionic gonadotropin will rise significantly after successful in vitro fertilization, doubling every other day, you can see the doubling of chorionic gonadotropin by blood test to determine the state of fetal development. Twenty-eight days after IVF transplantation, you can visit the clinic for routine pregnancy test, and if there is any abnormality, you can intervene as early as possible to avoid delay.