The early stage of successful implantation will not be nausea and vomiting, but about a week after intercourse, there will be no discomfort symptoms at the time of implantation, abdominal pain and small amount of bleeding will occur at the time of implantation. In about 6 weeks of pregnancy, the progesterone in the body increases significantly, and the human chorionic gonadotropin secreted by the placenta will also increase significantly, which will cause nausea and vomiting. It may be caused by indigestion, you need to go to the hospital for examination, under the guidance of the doctor reasonable take morpholine or stomach stomach dissipation tablets treatment, pay attention to eat more easily digestible food, such as millet porridge, milk, etc., can also eat more vegetables, fruits, to relieve nausea symptoms.