Most pregnant women in the 10th day of pregnancy have no obvious symptoms. A few pregnant women are sensitive to the hormonal changes in their bodies after pregnancy and will have early pregnancy reactions, such as nausea, fatigue, frequent urination and breast tenderness, when they are in the 10th day of pregnancy without obvious menopause manifestations. The first 3 days after fertilization, the fertilized egg is in the fallopian tube, and the fertilized egg cells keep dividing and proliferating while gradually running towards the uterine cavity in the fallopian tube, entering the uterine cavity on the 4th day and developing continuously, and the embryo is planted into the endometrium 6-7 days after fertilization and secretes the hormone human chorionic gonadotropin, which is unique to pregnancy. The early pregnancy reaction includes the following, and you can determine whether you are pregnant according to the following changes. 1. Menopause: The earliest symptom of most pregnant women is menopause. For women of childbearing age with normal sex life, if they have regular menstruation, they should be highly suspicious of pregnancy once their periods are over. 2.Early pregnancy reaction: Early pregnancy reaction can occur after pregnancy due to the change of hormone level in women’s body, such as coldness, dizziness, weakness of limbs, drowsiness, nausea and vomiting in the morning, dislike of greasy and sour food, etc. Most of them appear around 6 weeks of pregnancy and disappear on their own around 12 weeks. The reaction can be mild or severe, and can be relieved in mild cases after paying attention to diet and rest; in severe cases, the nausea and vomiting reaction is so severe that it leads to inability to eat and drink water, electrolyte (mainly K ion) disorder, and in severe cases, abnormal liver function, fever, miscarriage or ketoacidosis of pregnant women. Therefore, heavy pregnancy vomiting needs to be treated by hospitalization with infusion. 3, frequent urination: In the first pregnancy, the enlarged uterus presses the bladder in front of the pelvic cavity, resulting in frequent urination of pregnant women. As the pregnancy lengthens, the enlarged uterus gradually enters the abdominal cavity and the symptoms of frequent urination gradually disappear. 4, breast changes: pregnant women can feel their own breast swelling and pain, breast volume gradually becomes larger, nipple enlarges, easy to erect, areola enlarges, coloring deepens, can appear Montserrat nodules (dark brown nodules around the areola). Because the above symptoms are usually not obvious in the 10th day of pregnancy, the doctor relies mainly on auxiliary tests to clarify whether or not the pregnancy is present: i.e. blood HCG measurement. at this time the embryo is still too small to be seen by ultrasonography, so the site of pregnancy cannot be clarified and it is not possible to determine whether or not the pregnancy is intrauterine. All pregnancies have a 2-3% chance of ectopic pregnancy, and once abdominal pain is present you should go to the hospital for an emergency visit, except for ectopic pregnancy.