The vague pain in the stomach on the eighth day after IVF transfer is a normal phenomenon, there is no need to worry, it is mainly related to the following situations: 1. the pain may be caused by the reflex of the instruments pulling the uterus during the IVF embryo transfer process, in this case there is no need to worry, the pain will not last long, pay more attention to rest. 2. there may also be an increase in the volume of the ovaries during the ovulation promotion process, resulting in uncomfortable, vague pain and nausea. In this case, it is recommended that infertility patients pay more attention to rest and eat a high-protein diet, such as more eggs, milk, lean meat and other high-protein foods, which will slowly ease, and try not to eat spicy and stimulating foods.