Some women have an upset stomach a few days after the fertilized egg is deposited and some women have no discomfort a few days after the fertilized egg is deposited. Some women will have an upset stomach a few days after the fertilized egg has been deposited. This condition is related to changes in hormone levels in the body, after the fertilized egg has been deposited, the trophoblast cells begin to secrete blood HCG (human chorionic gonadotropin), and the level of blood HCG slowly rises, which may stimulate the gastrointestinal tract triggering gastric discomfort, anorexia, nausea, vomiting and other symptoms. Stomach discomfort a few days after the fertilized egg has been deposited may also be related to stomach disorders, such as gastrointestinal dysfunction, indigestion, gastric ulcers, gastritis, etc. These may also trigger symptoms such as stomach pain, bloating, burning sensation in the stomach, nausea, vomiting, belching, and so on. Each woman’s physical condition is different, and the reaction shown by the body a few days after the fertilized egg is implanted is also different. Some women have no discomfort after the implantation of the fertilized egg, which is a normal phenomenon, and it is not possible to judge whether the implantation of the fertilized egg is successful or not based on the condition of the stomach. If a woman’s stomach is upset and the symptoms are more serious, she should seek medical attention.