Embryo implantation time

Definition of fertilized egg implantation

Implantation is a process in which the early embryo of a fetal mammal combines with the uterine wall of the mother and establishes structural connections between the mother and the child to achieve material exchange. After implantation, maternal intake of maternal blood continued to develop. Implantation is a process of preparation and cooperation between mother and son.

The implantation time of fertilized eggs is within 9-11 days after ovulation.

On the first day of pregnancy, most of the spermatozoa died in the acidic vaginal environment. Only a few spermatozoa passed through the cervix and reached the uterine cavity within an hour. After another 1-2 hours, the spermatozoa traveled a total of 18 cm, and finally reached the ampulla of the fallopian tube and combined with the egg to form a new fertilized egg. Life begins here, and in the next 266 days, the baby will grow in your womb.

Second days of pregnancy: the first cell division will occur today, and your baby will grow safely.

Third days of pregnancy: the fertilized egg has undergone 3~4 divisions. The division and growth of cells depend on the nutrition inside the eggs.

Day 4 of pregnancy: When the fertilized egg divides, it gradually moves toward the uterus due to the movement of the cilia and muscles of the fallopian tube. It reaches the uterine cavity 4-5 days after fertilization, and then stays in the cavity for 3-4 days.

Fifth days of pregnancy: today’s fertilized eggs are undergoing important changes, and they are preparing for implantation into the uterus.

On the 6-7 day of pregnancy, the fertilized egg adheres to your uterine mucosa to prepare for implantation.

Pregnancy eighth to eight days: the implantation process has begun. The embryo goes into the uterine mucosa, so you may have some slight bleeding.

Pregnancy is ninth or nine days: the process of fertilized egg implantation has been completed so far. Embryos grow very rapidly, but it is too early to determine early pregnancy.

Day 10 Pregnancy: The first thing a developing baby can do is his cardiovascular system, which starts beating a week before your menstruation is delayed.

Day 11: The placenta begins to form at the insertion site, and blood from your circulatory system begins to circulate in the placenta.

The above is the specific time of fertilized egg implantation. Successful implantation usually means successful pregnancy. From this time on, mothers will have to raise their foetuses and prepare for the coming of new life.

Embryo implantation symptom

1. Cool down

To understand what is “implantation cooling”, we must first understand what is implantation. Implantation refers to the process by which the early embryos of prenatal mammals combine with the uterine wall of the mother to establish structural links between the mother and the child to achieve material exchange. After implantation, maternal intake of maternal blood continued to develop. Implantation is a process of preparation and cooperation between mother and son.

Fertilized eggs move slowly in the fallopian tube (3-5 days), and after successive multiple divisions form mulberry embryos into the uterine cavity and continue to develop into blastocysts (called blastocysts). Outside the blastocyst, around the zona pellucida, the uterine milk secreted by the uterine gland continues to develop. As the blastocyst grows, the zona pellucida expands and thins and breaks off (or is dissolved); the embryo is released from the capsule. The germ cells of the outer wall of the embryo are exposed and are directly in contact with the endometrium. Implantation is an important link in the early stage of viviparous embryo development.

2, the chest becomes softer.

If your breasts are tingling, soft and swollen, you may be pregnant. This symptom may occur a few days before conception. If you suddenly fail to recognize your breasts, you may be pregnant. Don’t worry! After your body has adapted to a lot of hormones, the pain will subside and your breasts will no longer feel uncomfortable.

3, feel tired

Always energetic, do you suddenly feel tired? A large amount of secretion of luteinizing hormone can make you feel exhausted. Almost all pregnant women suffer from this symptom, and you can look at other symptoms to confirm your suspicion.

4. Frequent toilets

Do you become a frequent visitor to the toilet? Getting up in the middle of the night to go to the toilet? Blame it on your little life! Fertilized eggs begin to secrete villous gonadotropin (hCG) after implantation into the uterine wall. If you are fed up with getting up in the middle of the night, don’t worry. Think of it as a kind of training, because in the future your baby will be crying and hungry in the middle of the night before you really realize it.

5. Do you have symptoms of bleeding or spasticity?

Eight days after ovulation and implantation, slight pink or brown stains may appear, and spasms may accompany this. There may be some punctate bleeding during the physiological period, but this is not a real physiological period. This is the result of implantation of fertilized eggs into the endometrium.

Embryo implantation requires several days.

The fertilization capacity of ovaries is about 12-24 hours, but the fertilization capacity of sperm to egg is only 1-2 days. The egg is fertilized in the ampulla of the fallopian tube, then the fertilized egg moves slowly in the fallopian tube and enters the uterine cavity after 3-4 days. In general, ovulatory sperm will normally be implanted within 7 days after ovulation.


Embryo quality is an important factor affecting embryo implantation time. The sperm and egg combine to form fertilized eggs, and the quality of the embryo depends on the genetic quality of the parents. If sperm quality is poor, chromosomes of eggs or sperm are abnormal, embryo implantation will also be abnormal.

In addition, endometrial environment also affects embryo implantation. The endometrium is the place where the embryo is implanted. If the endometrium is thick enough, blood flow is rich and cells divide well, it will increase the implantation rate and the implantation time is relatively fast. However, if the endometrium is too thin, the blood flow is insufficient and the endocrine is lacking, the embryo will not be easy to implant.

Does embryo implantation cause bleeding?

Implantation occurs about six days after fertilization, when most mothers do not respond particularly well, and a few women shed red or pink blood, which is called implantation bleeding. This symptom is not for everyone, so it is not an obvious sign of pregnancy.

Implantation bleeding occurs about 7 days after conception. If it is 7-10 days from ovulation day, it can be suspected that it is implantation. You can go to the hospital for examination. If it is more than 12 days from ovulation day, it may be menstruation.

Fertilized eggs implantation is normal will not bleed, if the sex happens to ovulate women, and male sperm activity is good, generally in 24-48 hours to conceive, women do not have any feelings when implantation, and only a small number of people will be fertilized eggs implantation due to physiological and physical problems and a small amount of blood. Implantation bleeding is a kind of dysfunctional uterine bleeding (dysfunctional uterine bleeding). Owing to the fact that one follicle develops and matures in every menstrual cycle of women of childbearing age, the level of estrogen in the body also increases gradually. When mature follicles rupture and ovulate, the level of estrogen in the body drops sharply, so that the growth of endometrium can not be maintained, resulting in local endometrial necrosis and exfoliation. For vaginal bleeding, the follicles quickly form corpus luteum after ovulation, the corpus luteum can secrete a certain amount of estrogen and progesterone, so that the ruptured endometrium quickly repair, and thus automatically stop bleeding.