The abdominal swelling on the 8th day after transplantation should be analyzed based on the medical history. If fresh embryos are transferred, ovarian hyperstimulation syndrome should be ruled out based on the number of eggs, HCG, estrogen levels and the absence of abdominal enlargement, weight gain and decrease in urine output. In the absence of these symptoms, ovarian hyperstimulation syndrome can be ruled out, while abdominal cramping on the eighth day after the transfer is a more common discomfort. Due to the increase of estrogen and progesterone in the body, the pelvic cavity is in a state of bruising, so discomfort will occur, so do not be too nervous, as long as you take your medication on time, rest normally and walk properly.