Implantation of the fetal egg is preceded by the exit of the fetal egg and its long journey through the uterine tube into the uterine cavity. This process takes approximately 3 days. Another egg moves along the uterus in search of a place for implantation. And only on the seventh day after the fertilization of the blastocyst begins introduction into the layer of the epithelium of the uterus.
And the process of introducing the fetal egg into the wall of the uterus is called implantation. But do not think that this happens instantly. The timing of attachment of the fetal egg is about 40 hours.
Sometimes there is a slight damage to the mucosa, which is manifested by a slight bleeding, which is a sign of implantation of the embryo . Often this does not happen at all, or occurs, but imperceptibly for a woman. Pain during implantation of the fetal egg should not be normal. True, some women claim that they felt the moment of implantation.
Almost immediately after attaching the fetal egg, its outer layer begins to produce hCG - the so-called pregnancy hormone. It is he who notifies the entire body of the onset of pregnancy. Yes, and pregnancy tests are focused on the recognition of the concentration of this hormone. And the cherished 2 strips appear when the concentration of hCG reaches a certain level.
Location of the fetal egg in the uterus
A fetal egg can be implanted in different places of the uterus, depending on some circumstances, but most often it occurs on the anterior or posterior wall of the uterus. The most favorable attachment of the fetal egg in the bottom of the uterus. If there is a low implantation of the fetal egg, this threatens placenta previa in the future.
The truth is not to panic during the early stages of pregnancy, if you have an ultrasound revealed that the fetal egg is attached to the uterus low. In 95% of cases with the course of pregnancy the placenta migrates, rising all the way to the bottom of the uterus.
In the remaining 5% of cases, there is every chance to completely transfer the pregnancy and give birth without complications. Simply you need to limit yourself to physical exertion, and at the time of birth the doctor should carefully monitor your condition - there is a risk of early placental abruption during pregnancy , followed by bleeding and hypoxia of the child.
And if you still have a full placenta previa, then you will have to give birth through caesarean section, because the placenta completely blocks the cervical shedding and the child simply can not get out naturally. But it's too early to think about all this, let everything go on as usual.
Why does not the fetal egg attach?
If the attachment of the fetal egg to the uterus does not occur, the pregnancy ends, and not having time to step on. Usually the fetal egg goes along with the menstruation, and since no delay occurs, the woman does not realize that she has a miscarriage.
The cause of this phenomenon can be a hormonal failure (high or low concentration of progesterone, estrogen, prolactin, glucocorticoids and so on).
Of great importance is the readiness of the mucous membrane of the uterus to adopt a fetal egg. If a woman before doing abortion, scraping, wearing an intrauterine device, has untreated infectious and inflammatory diseases in time, this breaks the receptor apparatus of the endometrium and it reacts inadequately to hormones.
As a result, the mucosa is poorly prepared for pregnancy. And if the fetal egg itself is not active enough, does not provide the necessary amount of enzymes that destroy the mucosa in due time, then it can occur in the cervix (cervical pregnancy), abnormal placenta, or no implantation at all.