There are usually no obvious signs when you are two weeks pregnant. The number of days of pregnancy is counted from the last menstrual period. When you are two weeks pregnant, the fertilized egg may have just formed, and there are no obvious symptoms at this time. In the early stages of pregnancy, you may experience abdominal discomfort, breast swelling, easy fatigue, etc. The most obvious sign is the delayed absence of menstruation. When you are about 40 days pregnant, you may experience gastrointestinal reactions such as nausea and vomiting. Therefore, for women of childbearing age who are sexually active, it is necessary to check if you are pregnant if your period is delayed for more than a week. In this case, you can take a blood test or use early pregnancy test paper to test for pregnancy, among which the blood HCG test can be done at the hospital about 10 days after intercourse to check the blood HCG level. The early pregnancy test is a test that shows two red lines, which indicates pregnancy. Generally, the above tests cannot determine the pregnancy in the uterus, so an ultrasound is also needed at the same time. The gestational sac is visible at 35 days of menopause and the germinal bud and primordial heartbeat are visible at 42 days. Ultrasound is usually done 3-5 times during pregnancy, once in early pregnancy to determine pregnancy and diagnose common diseases in early pregnancy such as ectopic pregnancy and hyperemesis gravidarum. In the middle of pregnancy, that is, from 22 to 26 weeks of pregnancy, 4D ultrasound screening is done to determine whether the fetus has any major malformations and major organ malformations. In short, pregnant women should follow the doctor’s instructions for the appropriate examination according to their own situation.