Under normal circumstances, the fertilized egg will not appear clinical symptoms, so most of the stomach rumbling is due to peristalsis of the intestines. If the peristalsis is hyperactive, there will be rumbling, or in the case of hunger, there will be hyperactive peristalsis, and there will be bowel sounds. This is a normal clinical phenomenon, and there is no need to be nervous, but this phenomenon has nothing to do with implantation. The other thing is that after implantation, the trophoblast cells start to secrete blood HCG, and then the estrogen in the body starts to rise slowly. With the increase of estrogen, there will be early pregnancy reactions related to pregnancy, such as nausea, vomiting, anorexia, drooling and other gastrointestinal reactions.