A test strip test will still show pregnancy after a fetal loss, and will not truly reflect the loss of pregnancy. The principle of the test paper to detect pregnancy is to detect the concentration of HCG in the urine to determine whether the pregnancy. After the embryo stops, the HCG in the mother’s body does not drop so quickly and return to the pre-pregnancy level, so the test paper test will still show the pregnancy status. An effective and accurate way to detect fetal arrest is clinical ultrasound. During pregnancy, pregnant women should self-monitor fetal movement and go to the hospital for obstetrics and gynecology examination at the first time if they find any abnormalities such as abdominal pain or vaginal bleeding. Under the guidance of a professional doctor, clinical ultrasound is used to determine the developmental status of the fetus and to ensure healthy fetal development.