How many days does biochemistry usually occur?

As we all know, human chorionic gonadotropin can be secreted seven days after the combination of sperm and egg, and then it can be detected by early pregnancy test strips in about a week. Under normal circumstances, the sperm and egg combine and need to combine into a fertilized egg, and the fertilized egg needs to return to the uterus to implant. Biochemical pregnancy means that the sperm and egg combine, but do not return to the uterus to implant, or they return but do not implant. This process is called biochemical pregnancy.

Biochemical differential diagnosis

1. Habitual miscarriage: Habitual miscarriage refers to more than three consecutive spontaneous abortions, each of which often occurs in the same month of pregnancy. Traditional Chinese medicine calls it "slippery fetus". The causes of habitual miscarriage are mostly luteal insufficiency, hypothyroidism, congenital uterine malformations, uterine developmental abnormalities, intrauterine adhesions, uterine fibroids, chromosomal abnormalities, autoimmunity, etc.

2. Spontaneous abortion: Spontaneous abortion refers to the termination of pregnancy before 28 weeks and the fetal weight is less than 1000g. This definition is based on the abortion deadlines set by the World Health Organization in 1966. At present, there are many controversies about the period of abortion. Some countries limit the abortion period to 25 weeks or even 20 weeks, because in developed countries, newborns with a gestational age of more than 20 weeks and a weight of 600 to 700 grams also have a chance of survival if they receive adequate treatment.

3. Missed abortion: Missed abortion: also known as delayed abortion or retained fetus. It refers to the embryo that dies but remains in the uterine cavity, and the products of pregnancy are generally expelled within 1 to 2 months after the onset of symptoms. Therefore, it is stipulated that if the embryo has not been expelled naturally within 2 months after it stops developing, it is called missed abortion. Many pregnant women experience threatened miscarriage in early pregnancy. After that, the uterus no longer grows, but gradually shrinks, and is not as soft as in normal pregnancy. The pregnancy test changed from positive to negative, and the placenta became tightly adhered to the uterine wall and was not easy to separate. On the other hand, due to the lack of sex hormones, the contraction force of the uterus is reduced, making it difficult to expel the fetus and thus retaining it in the uterine cavity.

The above is an introduction to how many days a biochemical pregnancy generally occurs in a woman and its biochemical diagnosis. Biochemical pregnancy is a subclinical miscarriage and should be differentiated from other miscarriages due to illness or accidents. If it is a biochemical pregnancy, it will not have a big impact if it happens occasionally. After the menstrual cycle ends, things will return to normal and it will not affect future pregnancy, so women don’t need to worry too much.