Nausea after eating may be an early reaction to pregnancy or a digestive disorder, so it is best to go to the hospital for a checkup. Early pregnancy diagnosis is mainly based on the history of menopause, early pregnancy reaction, and laboratory tests, that is, blood HCG and urine HCG. early pregnancy reaction usually occurs around six weeks after menopause, which can be manifested in many ways, such as nausea, vomiting, greasiness, fatigue, dizziness, drowsiness, and some pregnant women may also have mood changes. However, early pregnancy cannot be diagnosed on the basis of the appearance of early pregnancy reaction. Clinically, early pregnancy test paper is mostly used to test the urine of the examinee or to check the blood HCG, and if the result is positive, early pregnancy can be diagnosed. But to determine whether the pregnancy is intrauterine, but also need to do ultrasound, early pregnancy ultrasound is mainly to determine the intrauterine pregnancy, to exclude ectopic pregnancy, usually recommended in the menopause 5-6 weeks can do ultrasound.