During pregnancy preparation, menstrual delay may not only be "winning the lottery", but also biochemical pregnancy!

Yesterday, a patient in the background left a message saying: The great aunt did not arrive on time, tested with early pregnancy test strips, saw a faint "squadron leader" line, thought it was "winning the lottery", who had thought that the hospital had an examination but was told that it might be a biochemical pregnancy.

There are many women who don't know much about what "biochemical pregnancy" is, and today I will tell you about it...

What is biochemical pregnancy

After the combination of sperm and egg to form a fertilized egg, it is transported to the uterine cavity through the peristaltic action of the fallopian tubes, reaches a suitable position in the uterine cavity, and "roots" in the endometrium, a process called implantation of the pregnant egg. Biochemical pregnancy, also known as subclinical abortion, insidious abortion, and subclinical early embryo loss, refers to the situation that after the combination of sperm and egg to form a fertilized egg, it has not successfully implanted in the uterine cavity and the pregnancy state is naturally terminated.

Why biochemical pregnancy occurs

Defects in fertilized eggs

Clinical investigations have shown that chromosomal abnormalities in embryos may be the main cause of biochemical pregnancy, accounting for about 50% or more of early miscarriages in the first 3 months of pregnancy.

Ovarian factors

Poor ovarian function or poor luteal function leads to insufficient progesterone secretion and abnormal endometrium, which in turn affects the implantation of the fertilized egg in the uterus.

Uterine factors

Uterine diseases such as uterine adhesions, endometrial tuberculosis, endometrial polyps, uterine dysplasia, and submucosal fibroids can affect the implantation of a fertilized egg.

Immune factors

It is mainly divided into 2 cases, one is the same kind of immunity - sperm, seminal plasma or fertilized eggs are antigenic substances, which are absorbed by the vagina and uterine epithelium, and then produce antibody substances through immune responses, so that sperm and eggs cannot be combined or fertilized eggs cannot implant; The other is autoimmunity – it is believed that there are zona pellucida autoantibodies in the serum of infertile women, and reacting with the zona pellucida prevents sperm from penetrating the egg, thus preventing fertilization.

Are biochemical pregnancies and miscarriages the same thing?

Both biochemical pregnancy and miscarriage are pregnancy failures, but they are not the same thing.

Biochemical pregnancy is a stage of pregnancy that is only carried out to the point where biochemical methods can be detected, and has not yet developed to the stage where the gestational sac can be diagnosed with ultrasound, so it can be counted as a special type of early pregnancy loss; Abortion, on the other hand, is an event that occurs after embryo implantation and refers to the loss of clinical pregnancy, so although both biochemical pregnancy and abortion belong to the category of embryonic or pregnancy loss, they occur at different physiological stages, so the two are different.