The process of conception is a complicated and delicate one, and any problem in any part of the process will lead to abnormalities in the pregnancy, which may result in developmental abnormalities at a lesser degree, or death of the child and miscarriage at a more serious degree. Nowadays, it is still not uncommon to see embryonic failure or miscarriage in the early stages of pregnancy (up to 3 months from the last menstrual period), and many people are very worried because of this. First of all, I would like to explain the causes of early miscarriage. Most of the early miscarriages are caused by genetic problems in the development of the child, that is to say, the child has genetic problems, which may lead to the absence of certain enzymes in the body, or problems with the vital organs, so that the child will not be able to survive, and will not be able to continue to develop in the mother’s body at a certain point, which will be shown by death. At a certain point in time, the child will not be able to continue to develop in the mother’s body and will manifest itself in death. Such early abortion, we know that the vast majority is the process of survival of the fittest, was eliminated by the child is not good children, so there is no need to feel particularly sorry, as for what causes the child out of the problem, it is not very good to check, nowadays the society, the environmental pollution exists everywhere, eat food, breathe the air, contact with hazardous substances want to hide can not avoid, so usually, there is no need to Therefore, it is usually not necessary and not possible to conduct a detailed examination of the causes of miscarriage. If there are more than 3 early miscarriages, which are called habitual miscarriages, it may be necessary to look for the cause in the hospital. Doctors may investigate the cause of multiple miscarriages in terms of chromosomes, endocrine system, immune function, and the morphology of the reproductive tract, but it may not always be possible to find the cause. Another common misconception is to check luteal function during pregnancy when there is a miscarriage, or even when there is no miscarriage. Drugs such as progesterone are somewhat abused. Some hospitals are now unnecessarily checking progesterone levels in pregnant women without any abnormalities during pregnancy, and as soon as they check for a low level, they use progesterone to start injections or oral progesterone, typically over-diagnosing and over-treating. Progesterone is only effective in cases of low luteal function, and as mentioned, most early pregnancy miscarriages are due to problems with the child itself, with low progesterone being the result, and the use of progesterone does not prevent a miscarriage from occurring. Between 4-8 weeks from the start of menopause is a high-risk period for vaginal bleeding, if there is bleeding, checking serum progesterone can help determine the prognosis, if the progesterone result is below 5ng/ml, then the child has a high chance of miscarriage, if >25ng/ml, it is a normal intrauterine pregnancy, and between 5-25ng/ml, it is a situation that needs to be further observed. However, this is not an indication to use progesterone, so just observe the changes. Blood βhCG should normally double within 48-72 hours, and if it does not, it suggests the possibility of miscarriage or ectopic pregnancy. Combining this with an ultrasound at this time helps the clinician understand the possible problem.