According to the latest studies, it seems that spontaneous abortion would have a greater relationship with the day on which implantation occurs after the moment of conception.
It seems that every time new causes are being discovered that can cause the pregnancy not to reach term, especially during the first weeks of pregnancy, when there is a greater risk (especially and especially between weeks 6 and 8).
The truth is that miscarriage is more common than you think; Obviously, most women do not go around telling that they have suffered an abortion prior to their new pregnancy, or even if they already have some children. The statistics are clear in this regard: a quarter of pregnancies end in miscarriage.
In fact, while the risk of miscarriage in a woman between 20 and 30 years of age is 12%, between 30 and 40 years the risk increases to 15%; however, after 40 years of age the risk rises 10 points (up to 25%).
Most abortions occur before week 24 of pregnancy, the most common being those that occur before week 12, mostly as a consequence of chromosomal abnormalities in the fetus, and these occur by chance, not having to be related to genetic problems in the mother or father.
Until a few years ago it was suspected that spontaneous abortion could have a special relationship with the day of implantation; that is, with the day on which the fertilized ovum was implanted.
Recently, a study, has revealed that miscarriage is also related to the day of implantation, so that:
- If the embryo attaches (implants) nine days after fertilization, the risk of miscarriage is 13%.
- If the embryo implants ten days later, the risk of miscarriage increases to 26%.
- If the embryo implants eleven days later, the risk of miscarriage increases to 52%.
- If the embryo implants later, the risk increases to 82%.
There are several reasons why the risk of miscarriage increases with late implantation:
- The receptivity of the endometrium decreases during the late luteal phase, which means that the woman’s body is even wiser than it is thought, since we would find ourselves before a natural mechanism by which damaged embryos are eliminated.
- The corpus luteum is less sensitive to the hormone chorionic gonadotropin 11-12 days after ovulation.
- Unhealthy embryos can develop more slowly, influencing abnormal implantation that results in late and weaker production of the hormone HCG.
Therefore, as a conclusion of the study, when implantation occurs between 8 and 10 days after ovulation, the pregnancy is much healthier, reducing the risk of miscarriage.
What is implantation?
Before talking about implantation, we must talk about what is known as implantation bleeding, since it occurs as a consequence of the fertilized egg having implanted or nested in the uterus.
It is a type of mild bleeding, with a lighter texture, less thick, and whose color can vary from pinkish tone to a little more brownish.
By implantation we understand the moment in which the zygote reaches the uterus and solidly adheres to the endometrium, where it will be nourished by the maternal blood.
Right from the moment of conception, your body actively “works” to make room for new life. For this reason, just after fertilization, cell division occurs, so that in the first 12 hours the unicellular zygote divides into two cells, and these in turn divide into two others (and this continues, doubling every 12 hours).
Meanwhile, the zygote moves through the fallopian tubes, until it reaches the uterus, at which point it sticks to the wall until it begins to produce enzymes that will help it digest the lining of the uterus, allowing it to nest in the endometrium.
On what day does the implantation take place?
After conception, implantation usually occurs 7-10 days after fertilization. In fact, the most common is that by day 12 the blastocyst has already nested in the endometrium, which we could consider as its new “home”.