What are the reasons for spontaneous abortion?

What are the pre-pregnancy preparations for spontaneous abortion? What are the causes?

Causes of spontaneous abortion

1. Common causes of fetal chromosomal abnormalities include: first, teratogenic factors in the environment, including radiation, viruses, drugs, etc. acting on sperm, eggs or fertilized eggs, leading to fetal chromosomal abnormalities; another reason is that one or both parents of the fetus have chromosomal abnormalities and are carriers of chromosomal abnormalities. Although there are no abnormalities on the surface, the embryos they conceive are basically chromosomally abnormal, leading to embryonic development disorders and causing miscarriage.

2. Reproductive medicine research has found that ovulation occurs on the 14th day from the time of the last menstrual period, and the sperm and egg form a fertilized egg. The fertilized egg migrates from the fallopian tube to the uterine cavity 72 hours later, and the embryo implantation is completed in 7 days, that is, the embryo invades the endometrium and establishes a blood relationship, which is equivalent to about the 22nd day of menstruation. Clinically, the mother's blood can be checked for elevated human chorionic gonadotropin (HCG). If the embryo implants, it is a biochemical pregnancy, which can be considered an early pregnancy.

3. If the menstruation comes on time or is delayed for a few days and the bleeding is the same as the menstrual volume, the gestational sac is very small or invisible on ultrasound, and the HCG level is decreased, consider biochemical pregnancy abortion. Generally, if the blood HCG level is elevated, the gestational sac can be seen on ultrasound after 20 days, which is equivalent to the fetal heartbeat being visible 50 days after amenorrhea. After a biochemical pregnancy abortion, the impact on women is not great, and they can get pregnant after the next normal menstruation. Biochemical pregnancy abortion was not noticed by people before, but it is now believed that the incidence of such abortion is very high, but it is not taken seriously by people.