In the 3rd-4th days of pregnancy, there is usually no obvious reaction. At this time, the fertilized egg has not yet bedded down, and the hormone level in women’s body is stable and fluctuates little, thus most women do not react. However, there are a few women with sensitive constitution who may experience fatigue, drowsiness, loss of appetite, back pain, chest pain, etc. Usually, you can detect your pregnancy by taking a blood test for HCG value about 12 days after intercourse. If the HCG level is greater than 5, it usually indicates pregnancy. After pregnancy is confirmed, most pregnant women usually experience some degree of early pregnancy reactions, including nausea, vomiting, headache, dizziness, chest pain, etc., for more than 40 days after pregnancy. Usually early pregnancy reactions do not require special treatment, but if the symptoms are severe, it is recommended to take a routine urine test in the middle section of the urine. If there is a plus sign of urinary ketone body, the diagnosis is severe pregnancy vomiting, which needs further examination and treatment. In addition, pregnant women with symptoms of breast swelling and pain should not squeeze their breasts, which can easily cause mastitis, and can scrub clean and massage their breasts gently as appropriate. In the early stage of pregnancy, pregnant women should avoid exposure to toxic substances and radiation to avoid affecting fetal development. You can’t have sex because early pregnancy is a high incidence of spontaneous abortion, and sex can easily stimulate uterine contraction and lead to miscarriage. In case of abdominal pain or vaginal bleeding, you should go to the hospital in time to have an examination to confirm whether the pregnancy capsule is in the uterus or not. Once the pregnancy is diagnosed as ectopic, you should promptly undergo medication or surgery.