"The two bars on the pregnancy test stick just made the whole family happy, but they became popular within a few days. Are we hoping for the wrong thing?" In assisted reproduction clinics, such questions can always hit the pain points of countless couples planning to get pregnant. This kind of "happy event turns into false alarm" is medically called biochemical pregnancy. For those who experience this after transplantation, confusion and self-blame often follow. But in fact, biochemical pregnancy is not a "judgment of failure", but a signal from the body and a reflection of the wisdom of natural selection. Today, we will break down the key issues and help you clarify your coping ideas.
,30%,,12%~30%.Behind the seemingly high probability is the "hidden pregnancy" that many people are unaware of-many biochemical pregnancies are directly ignored as delayed menstruation because their symptoms are similar to menstruation. Only by understanding it and understanding it can we better welcome the next hope.
Biochemical pregnancy, also known as "subclinical abortion", is essentially a very early pregnancy loss in which the sperm and egg are not successfully "rooted" in the endometrium.
,“”,,“”.If the embryo is compared to a "seed" and the uterus is compared to a "soil", this process is like a seed that has just come into contact with the soil and is naturally metabolized before it has time to germinate, and it has not even reached the stage of forming a pregnancy sac.
,7,(HCG),“”.But if the implantation fails, HCG levels drop rapidly, followed by menses-like bleeding. Because it occurs within 5 weeks of pregnancy, B-ultrasound does not see the gestational sac at all, and only biochemical indicators show signs of pregnancy, which is why it is called "recessive abortion".
,?Three core reasons are revealed
1. Embryonic factor: natural "survival of the fittest"
Embryo chromosomal abnormalities are the most important cause of biochemical pregnancy, and there is no one. Even if doctors select embryos that appear to be in perfect shape, there is still a 25% chance of having chromosomal problems. Especially for women over the age of 35, as the quality of eggs declines, the risk of chromosome non-separation will increase significantly. This is actually the body's self-protection mechanism-actively eliminating embryos with insufficient development potential to avoid abnormal pregnancies.
2. Maternal factor: Whether the "soil" is fertile is the key
The endometrium is the "hotbed" for embryo implantation, and its receptivity directly determines whether the embryo can stand firm. Studies have shown that when the endometrial thickness is less than 9 mm, the risk of biochemical pregnancy will increase significantly; while endometrial polyps, intrauterine adhesions, uterine fibroids and other problems will hinder implantation like "stones in the soil."
.Inadequate luteal function leads to insufficient progesterone secretion, hyperthyroidism or hypothyroidism, uncontrolled diabetes, etc., all of which may disrupt the hormone balance required for pregnancy and cause the embryo to lose its "nutritional supply" for survival.
3. Immune factors: don't treat embryos as "outsiders"
In recent years, the role of immune factors in biochemical pregnancy has attracted increasing attention. If the mother has autoimmune diseases such as antiphospholipid antibody syndrome and systemic lupus erythematosus, or the blood is in a hypercoagulable state, it may affect the blood supply to the placenta; another situation is "alloimmunity abnormality", that is, the maternal immune system mistakenly attacks the embryo as a "foreign invader", destroying the balance of immune tolerance and causing implantation failure.
Compared with natural conception, in addition to the above-mentioned general reasons, there are several special considerations for biochemical pregnancy in the IVF cycle.
,,,.The first is the development potential of the embryo. Morphological evaluation can only "look at the face" and cannot accurately judge the intrinsic quality of the embryo. Some seemingly high-quality embryos have problems with the actual chromosomes or genes, which makes it naturally difficult to implant.
“-”.During the artificial cycle, the use of exogenous hormones regulates the growth of the endometrium. However, if the hormone dose is inappropriate or the timing is wrong, it may cause the "implantation window period" of the endometrium to be out of sync with the development of the embryo-the embryo is ready., the endometrium is not yet "ready", and naturally misses the appropriate opportunity for implantation.
,.If the endometrium is accidentally damaged during the transplantation process, severe uterine contraction is caused, or the embryos are placed in the wrong position, the success rate of implantation may be reduced.
,?Don't worry, respond scientifically like this
Many people will fall into self-doubt after experiencing a biochemical experience: "Is my body not good?" However, medical research shows that a single biochemical pregnancy is mostly accidental, just like nature's "random screening". It will not affect subsequent fertility. Instead, it means that your ovaries can expel eggs, sperm can combine with eggs, and you have the basic condition for pregnancy.
:,--,,;,,.The second is to adjust the pace of pregnancy preparation. It is generally recommended to wait 1-2 normal menstrual cycles before attempting transplantation, so that the endometrium has enough time to repair. The third is to stabilize your mentality. Anxiety and stress will directly affect endocrine, which in turn affects egg quality and endometrial status, which will not be conducive to the next pregnancy preparation. You can divert attention through family companionship, interests and hobbies, and seek psychological counseling when necessary.
,?System inspection + precise intervention is the key
If two or more biochemical pregnancies occur in a row, they cannot be treated as "accidental" and a systematic examination needs to be initiated to find out the root cause.
,,.The second step is to evaluate the female reproductive system and determine whether there are organic lesions such as endometrial polyps and adhesions through hysteroscopy; and evaluate ovarian function and endocrine status through six sex hormone tests, AMH, thyroid function and other tests. The third step is immune-related examinations, focusing on screening for anti-phospholipid antibodies, antinuclear antibodies and other indicators to determine whether there are immune abnormalities or coagulation problems.
Based on the examination results, doctors will develop personalized treatment plans. Women with luteal phase deficiency can receive progesterone supplementation under the guidance of a doctor. Those with immune system abnormalities may need to use aspirin, low molecular weight heparin, or immunomodulators. If it is determined that recurrent biochemical abnormalities are caused by embryonic chromosomal abnormalities, third-generation in vitro fertilization technology (PGT) would be a better option. This technique involves genetic testing before embryo implantation, allowing for the selection of embryos with normal chromosomes for transfer, thereby reducing the risk of biochemical problems at the source.
The core of physical conditioning after biochemical pregnancy is "balanced nutrition + regular work and rest + moderate exercise."
,“++”.In terms of diet, we must ensure the intake of high-quality protein (lean meat, fish and shrimp, eggs, soy products) and vitamins (fresh fruits and vegetables), avoid spicy, stimulating, raw and cold foods, and do not deliberately "supplement". Balance is the key.
In daily life, it is important to ensure 7-8 hours of sleep per day, and avoid staying up late. Also, try to stay away from alcohol, tobacco, radiation-emitting environments, and toxic chemicals. Engage in moderate activities such as walking and yoga to improve overall health. However, avoid intense physical activities and excessive exertion.
,,,.Remember that every attempt is not a "repeat the same mistake", but an "optimization upgrade" based on previous experience.
:“”.Today, as assisted reproductive technology continues to develop, whether it is mentality adjustment after a single biochemistry or precise intervention after repeated biochemistry, there are mature medical plans as support. Fight with your doctor, be patient and confident, and your "good pregnancy" will come.