The second week of pregnancy belongs to early pregnancy, and the reaction is small at this time. Some pregnant women may not have any reaction except menopause, while some of them may have early pregnancy reaction, such as nausea, vomiting, etc. In addition, they may have other symptoms: 1. digestive tract reaction: they may feel nausea, salivation, lack of appetite, preference for acid, aversion to greasy food, vomiting in the morning, etc., which mostly disappear by themselves around 12 weeks after menopause; 2. emotional and physical changes: they may have weakness, drowsiness, 3. Breast changes: pregnant women may feel painful and swollen breasts, and when they check the volume of breasts, they may find that they are gradually increasing and there are obvious veins showing, some pregnant women may also have enlarged nipples, deepened nipple and areola coloring, sebaceous gland around the areola, and dark brown nodules; 4. Some pregnant women with heavy early pregnancy reactions may have skin pigmentation on the face, abdomen and areola, and may also have abdominal distension, constipation, frequent urination, back pain, etc. In addition to the above-mentioned conscious symptoms, pregnant women can also detect changes in the uterus and pelvis through regular pregnancy tests. Early pregnancy generally refers to pregnant women who have not reached 14 weeks of pregnancy, and there may be some danger of unstable fetus during this period, so it is recommended that pregnant women should have regular medical checkups and carry out pregnancy health work under the guidance of doctors.