The main manifestation of the fourth week of pregnancy is the absence of menstruation, which may result in symptoms such as breast swelling, increased urination, easy fatigue, gastrointestinal discomfort, and high body temperature. If you have sexual intercourse and your period is delayed, you may be pregnant. The earliest symptom of pregnancy is usually the absence of menstruation, and when you are about 40 days pregnant, you may experience nausea, vomiting and other early pregnancy reactions. If your period is delayed for 3-7 days, you can check if you are pregnant by taking a urine pregnancy test or a blood test for HCG, and a positive pregnancy reaction means you are pregnant. After pregnancy, you should pay attention to rest, maintain emotional stability, pay attention to strengthening nutrition, and regularly check the development of the fetus.