Twenty days of pregnancy should be more than 35 days after menopause. At this time, most people will have early pregnancy reaction, mainly manifested as dizziness, weakness, nausea, vomiting, drowsiness, fear of cold, not thinking about eating and drinking, etc. These are normal pregnancy reactions. Generally, these reactions are not very serious, and the symptoms are different for each person, so most people will gradually reduce or disappear by relaxing, adjusting the diet, eating less and more meals, and eating more fruits and vegetables. However, some people have serious reactions, can not eat, water and vomiting serious, should go to the hospital as soon as possible to perform ultrasound examination to see the pregnancy situation, if necessary, infusion treatment to prevent dehydration.