How many days does it take from conception to implantation?

People who are preparing for pregnancy usually hope to get pregnant right away, but sometimes this happens frequently. Even if they try very hard, they still cannot get pregnant. In fact, conception is a very complicated process. Although it seems that sperm and egg combine, this process is particularly complicated and is affected by many factors. Generally speaking, how many days does it take from conception to implantation?

How many days does it take from conception to implantation?

The entire process from fertilization to implantation of sperm and egg is carried out quietly. The fertilized egg implants on the 6th-7th day. Implantation means that it has reached the uterus, but it is still very small at that time and cannot be seen with B-ultrasound. The small gestational sac may be seen with B-ultrasound about 20-30 days after implantation. 3-4 days after the fertilized egg implants (that is, after the tenth day after ovulation), a weak positive result can be detected using a pregnancy test strip.

What does implantation of the fertilized egg mean?

After sexual intercourse, the semen ejaculated by the male contains more than 100 million to 300 million sperms. This huge "team" is "rushing" upstream in the female reproductive tract. The sperm swims at a speed of 2-3 mm per minute by swinging its tail. After a long "journey" - the vagina, cervix, and uterine cavity, it reaches the fallopian tube, where the sperm and egg (actually the secondary oocyte that remains in the metaphase of the second meiotic division) "meet". The head and body of the sperm enter the egg cell, and the sperm cell membrane fuses with the egg cell membrane. This egg is called a fertilized egg. Often only one sperm can enter the egg cell and combine with it to form a fertilized egg. This biological reaction that prevents multiple sperm from entering the egg cell is called the zona pellucida reaction.

Attachment With the partial perforation or total disappearance of the zona pellucida, the trophoblast near one end of the inner cell mass rapidly divides, and the tiny villi on the two opposite tissue surfaces, close to the endometrial epithelium, span the gap, widely intertwine in a finger-like manner, and then the villi are intertwined with each other. After the implanted blastocyst (also known as embryocyst) attaches to the endometrium, the cell membrane of the endometrial epithelial cells gradually disappears and becomes a multinucleated cell body. The trophoblast also differentiates into two layers. The inner layer retains the cell membrane, which is called the cytotrophoblast. The outer cell membrane disappears, called the syncytiotrophoblast. The syncytiotrophoblast has a strong corrosive power, eroding the uterine deciduous membrane, forming a small gap, allowing the blastocyst to slowly sink under the dense layer of the endometrium. About 10 days after fertilization, the entire blastocyst is located in the endometrium. On the 11th day, there is a closure plug composed of small blood clots and cell fragments in the endometrium. On the 12th day, the blastocyst is almost completely covered by the proliferating epithelium and forms a small bulge, and implantation is complete.

What should be paid attention to when the fertilized egg implants

1. Do not take over-the-counter medicines at will. Taking any medicine during implantation may cause fetal malformation. Therefore, if you feel unwell during implantation, you should go to the hospital immediately to find out the cause.

2. During the implantation period, you should avoid lifting heavy objects or strenuous exercise, and reduce housework and outings as much as possible. Avoid overwork, get more rest, get enough sleep, and control your sexual life to avoid accidental miscarriage.

3. Quit smoking and drinking. Drinking during implantation will delay fetal development and reduce fetal birth weight. Smoking during implantation can cause fetal malformations and increase fetal mortality. Therefore, you should quit smoking and drinking during implantation.