How many days does it take for the fertilized egg to reach the uterus?

Now that national policies are gradually opening up, the second child policy has become a hot topic among people. Many people are planning and planning to have children. So, how much do you know about having children? Today, we will popularize sexual knowledge for everyone and analyze how many days it takes for the fertilized egg to reach the uterus so that everyone can prepare for pregnancy.

Since women's ovulation periods vary and the timing of sexual intercourse is not fixed, the sperm must wait for the egg to increase the chance of meeting. Therefore, the length of time sperm survives in the female reproductive tract is closely related to fertility.

1. The residence time of sperm in the female reproductive tract: The acidic secretions of the vagina are usually at a pH of 3.5-4. Although theoretically fertilization can occur as long as there is one living sperm, in reality, due to the acidic environment of the vagina, most sperm die soon after entering the vagina. Only with the buffering of a certain amount of semen can the survival time of a very small number of sperm with strong vitality be extended, giving them the opportunity to enter the uterus and fertilize.

Without the sacrifice of a large number of sperm, without a certain amount of semen buffering to improve the acid-base environment in the vagina, a single sperm or a very small number of sperm would not be able to survive and fertilize in the acidic environment of the vagina.

Generally speaking, the survival time of sperm in the vagina is: 90% die 2 hours after sexual intercourse; after 36 hours, even the dead ones cannot be seen. In a pregnant woman's vagina, the stronger the acidity, the faster the sperm die.

2. The retention time of sperm in the cervix: Changes in the acidity and alkalinity of cervical mucus have a great impact on sperm penetration. When the pH is less than 6.5, sperm stops moving. At pH 7, it has slight penetration ability. At pH 7.5, the penetration ability is normal. At pH 8.2, the penetration ability is even stronger.

There is a lot of mucus blockage at the external opening of the cervix, which causes many sperm to be unable to penetrate and die outside. Cervical mucus is thick and tough just after menstruation; as ovulation approaches, the mucus becomes more abundant, clearer, and more stringy due to the increase of estrogen in the blood; during ovulation, the mucus is more abundant, clearer, and flows out, making it easier for sperm to penetrate.

Sperm penetrates cervical mucus by relying on the hydrolysis of enzymes. Trypsin-containing chymotrypsin and hyaluronidase can hydrolyze cervical mucus, reduce viscosity, and eliminate sticky thread formation, which is conducive to the passage of sperm.

Generally speaking, the survival time of sperm in the cervix is: inside the cervix, sperm can be found in the cervical mucus 15 minutes after sexual intercourse; one hour later, sperm enters the internal opening; inside the uterine cavity, sperm is found in the uterine cavity one hour after sexual intercourse, after 6 hours, all are active sperm, after 12 hours, 5/6 of the sperm are still alive, after 36 hours, 1/4 of the sperm are still alive, and after three days, there are no live sperm. But sometimes some individual sperm survive particularly long.

3. The retention time of sperm in the fallopian tube: In the fallopian tube, there will be active sperm 14 hours after sexual intercourse, and sometimes there will still be active sperm after 35 days. Generally, those after 14 days are the most active, and some enter the abdominal cavity. Those that move slowly are pushed back into the uterine cavity by the ciliary flow. The process and time of fertilized egg implantation within 11 days after PL

First day of pregnancy: JY is ejaculated into the posterior fornix of the vagina. Most of the sperm die in the acidic environment of the vagina, and only a small number of sperm pass through the cervix and reach the uterine cavity within 1 hour. After another 1 to 2 hours, the sperm has traveled a total of 18 cm and finally reaches the ampulla of the fallopian tube and combines with the egg to form a fertilized egg. A new life begins here, and in the next 266 days, the baby will develop in your uterus. Day 2 of pregnancy: The first cell division will occur today and your baby will develop safely. Day 3 of pregnancy: The fertilized egg undergoes 3 to 4 divisions. At this time, cell division and growth depend on the nutrition within the egg.

As 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 to 5 days after fertilization and then stays in the cavity for 3 to 4 days.

Day 5 of pregnancy: Today the fertilized egg undergoes important changes and is preparing to implant into the uterus. Day 6 to 7 of pregnancy: The fertilized egg adheres to your uterine mucosa and prepares to implant. Day 8 of pregnancy: The implantation process begins. The embryo burrows into the uterine lining, so you may experience some light bleeding.

Day nine of pregnancy: The fertilized egg implantation process is completed today. The embryo is growing very quickly, but it is too early to confirm with a pregnancy test. Day 10 of pregnancy: The first part of your developing baby's body to function is his cardiovascular system. Your baby's heart starts beating a week before your period is delayed.

Day 11 of pregnancy: The placenta begins to form at the site of the fertilized egg implantation, and blood from your circulatory system begins to circulate in the placenta.

Having a child with your lover at the right age is a happy thing and a symbol of a complete family. However, sex education in our country is not completely liberalized at present, and people are not aware of a lot of knowledge. Therefore, I hope everyone can read today’s introduction carefully to help themselves prepare for pregnancy better.