The earliest sign of pregnancy is the cessation of menstruation. If the menstrual period is more than 10 days after intercourse, the chances of pregnancy are considered to be higher. In addition, the body may also experience some uncomfortable symptoms after menopause, and the possibility of pregnancy can also be considered based on the manifestation of symptoms. For example, the body may suddenly feel very tired, or even feel light-headed, have no appetite, especially love to eat sour food, and become nauseous or vomit when smelling certain smells. At the same time, the breasts may begin to swell and increase in size, and the nipples and areolas may deepen in color. However, the above symptoms do not appear in all people, so if you want to know exactly whether you are pregnant or not, you need to go to the hospital for a test and have a serum HCG test. This test is done mainly by drawing the blood of the pregnant woman and observing the value of HCG, and is suitable for determining the early stage of pregnancy. Alternatively, if a woman wants to know more quickly if she is pregnant in her daily life, she can first buy a urine pregnancy test at a pharmacy to measure the level of HCG in her urine. When the level of HCG rises to a certain range, the test pen can see two bars, which is a positive indicator, indicating pregnancy. If the test result is negative, on the one hand, it means that you may not be pregnant, on the other hand, it indicates that the pregnancy is short and the HCG value has not reached the testable range, so it is negative. In this case, it is recommended to measure again after a period of time, or go to the hospital for other tests to clarify.