Today’s society is becoming increasingly polluted and the age of childbirth is gradually increasing, and the rate of miscarriage after pregnancy is also rising. As a result, many people panic after pregnancy and undergo various tests to prevent the occurrence of pre-eclampsia. Is this the right thing to do? What exactly is a preterm miscarriage? Is a low progesterone test without miscarriage symptoms a preterm miscarriage? Nowadays, many people blindly check indicators such as HCG (human chorionic gonadotropin) and progesterone without any symptoms and suspect that they are having a pre-eclampsia once the indicators are low, which is a very misconception. Because there are individual differences among people, progesterone indicators are only relative but not absolute reference values, especially in early pregnancy when progesterone secretion by the corpus luteum is unstable and has little reference significance. If the progesterone value is within the normal range of low levels, but there are no symptoms such as bleeding and abdominal pain, and the ultrasound examination of the embryo is normal, there is no need to worry. Excessive anxiety may instead increase the risk of miscarriage. It is not advisable to blindly take or inject progesterone to keep the fetus alive, because there are still some controversies about the side effects of progesterone; and if the fetus stops developing or if the pregnancy is ectopic, it is totally unnecessary to blindly keep the fetus alive. Therefore, it is advisable to follow the advice of a professional physician and first clarify the intrauterine status of the fetus. What are the symptoms of pre-eclampsia miscarriage? Before 28 weeks of gestation, if a mother-to-be experiences a small amount of vaginal bleeding, accompanied by lower abdominal cramps, back pain and abdominal distension, she should suspect a pre-eclampsia miscarriage. However, the color of the bleeding itself does not have much significance for the diagnosis. The variation in the appearance of bright red, pink or dark brown usually results from the amount of bleeding and the time the blood accumulates in the vagina. However, there are many clinical cases where there is a little vaginal bleeding around 30-60 days of pregnancy, but the bleeding is not significant and after rest, the bleeding disappears and the majority of pregnancies can continue, so there is no need to be too alarmed in this case. However, if the symptoms persist, you should be aware that it is a pre-eclampsia miscarriage and need to be examined and diagnosed in time. At this time, ultrasound should be preferred over blood tests for HCG and progesterone, because the value of the blood test does not determine the status of the fetus. Since ultrasound can only clarify whether there is a fetal heart and germ after six weeks of pregnancy, it is generally not recommended for pregnant women before six weeks to have ultrasound examination. Meanwhile, more than half of spontaneous miscarriages are caused by abnormal development of the fetus itself, so pregnant women are advised not to choose birth control treatment easily. Ectopic pregnancy and gravida may also cause vaginal bleeding in early pregnancy, how can they be identified? Dr. Li Kui told mothers-to-be, “Ectopic pregnancy can be accompanied by persistent abdominal pain along with a small amount of bleeding, while gravida is often accompanied by more intense early pregnancy reactions, such as severe nausea and vomiting. To identify with these two diseases, an ultrasound is sufficient”. When there are no symptoms of pre-eclampsia in early pregnancy, do not blindly do too many tests, which will only add unnecessary worries and is not conducive to the health of the pregnant woman and the embryo. If symptoms appear, ultrasound is preferred, preferably vaginal ultrasound, which allows for clearer observation of the intrauterine situation, reduces the number of examinations and does not affect the pregnancy.