Generally the test line is lighter than the control line there is a possibility of pregnancy, may be due to the short duration of pregnancy, but also need to follow the doctor’s advice to review the test. The embryo will secrete HCG (human chorionic gonadotropin) about 1 day after implantation, usually about 1 week after the menstrual period to use early pregnancy test paper to detect HCG levels in the urine to determine whether the pregnancy, when the test paper suggests that the test line is lighter than the control line, also suggests that the pregnancy is mostly due to the shorter duration of the pregnancy, and can be followed by the doctor’s advice to review the test. For pregnant women, blood HCG test can also be performed about 10 days after intercourse to determine whether they are pregnant or not, and the accuracy is high. The ultrasound should be performed at about 40 days after menopause to determine normal intrauterine pregnancy. Early pregnancy should also pay attention to proper rest, not tired and strenuous exercise, and need to follow the doctor’s advice to take folic acid on time to prevent the risk of neural tube defects in the fetus.