Aunt generally stands in for menstruation. The feeling of menstruation on the 7th day after blastocyst transplantation may be caused by the blastocyst not implanting or not growing normally after implantation. After blastocyst transfer, you should take more bed rest, and if you have the feeling of menstruation on the 7th day after transfer, first observe whether there is any symptom of irregular vaginal bleeding. It may be due to the fact that the transferred blastocyst did not implant or even after implantation, the blastocyst did not grow normally. If it is accompanied by vaginal bleeding, there is a possibility of preeclampsia, so you should consult the doctor in time and carry out fertility preservation treatment under the doctor’s guidance. However, if there is no vaginal bleeding, you can observe first, and it is normal to have some discomforts after blastocyst implantation, you need to rest in bed and do not exercise strenuously. The specific situation needs to be judged by the doctor’s interview, and give targeted treatment under the doctor’s guidance.