Symptoms of late implantation of pregnant fertilized eggs

summary

The implantation time of the fertilized egg（ The survival time of sperm in each link of female reproductive system is different because of the different ovulation period of women and the different time of sexual intercourse, which requires sperm to wait for the egg to increase the chance of meeting. Therefore, the survival time of sperm in female reproductive tract is closely related to fertility.

Symptoms of late implantation of pregnant fertilized eggs

The retention time of sperm in female genital tract: vaginal acid secretion is usually pH 3.5-4. Although theoretically only one living sperm can be fertilized, in fact, in the acidic environment of the vagina, most of the sperm will die soon after entering the vagina. Only under the buffer of a certain amount of semen, it is possible to prolong the survival time of a few strong vitality sperm and obtain the opportunity to enter the uterus and fertilize.

Without the sacrifice of a large number of sperm, and without a certain amount of semen buffer to improve the acid-base environment in the vagina, it is impossible for a single sperm or a few sperm to survive and fertilize in the acidic environment in the vagina. In general, the survival time of sperm in vagina is: 2 hours after sexual intercourse, 90% of them die; 36 hours, even the dead can't be seen. In the vagina of pregnant women, the stronger the acidity, the faster the sperm die.

The change of pH of cervical mucus has a great influence on sperm penetration. When the pH was less than 6.5, the sperm stopped moving. At pH 7, the sperm had a slight penetration ability. At pH 7.5, the sperm had a normal penetration ability. At pH 8. The penetration ability is stronger at 2. There is a lot of mucus blocking at the outer mouth of the cervix, which leads to many sperm can not penetrate and die outside.

matters needing attention

Cervical mucus is thick and tough in menstruation; When approaching ovulation, due to the increase of estrogen in blood, mucus becomes more and more clear, and the degree of silking increases; In ovulation period, the amount of mucus is more, clear, outflow, sperm easy to penetrate.