Implantation was successful on the fourth day of ovulation

Successful implantation on the fourth day of ovulation means normal fusion of sperm and egg, and then embryo implantation, which is the first step of successful pregnancy. Generally, embryo implantation will occur within seven days. The fusion of sperm and egg usually takes one to two days, and the sperm and egg will move slowly in the fallopian tubes after fusion. It usually takes three days to move into the pregnant mother's uterine cavity.

Normally, women only ovulate one egg in a month, and pregnancy will only occur when the egg combines with sperm. However, women's ovulation period will be affected by many factors, such as women's mentality, environment, work, and life pressure, which can lead to delayed or early ovulation. Generally, under normal circumstances, the sperm and egg combine to form an embryo within one week after sexual intercourse. Embryo implantation means that the sperm and egg have moved to the pregnant mother's uterus. At this time, it cannot be seen by using B-ultrasound equipment. A situation can only be seen in the small fetal sac about one month after embryo implantation.

Although the implantation time after ovulation is normally within a week, for some women the embryo implants ten to twelve days after ovulation. Therefore, the implantation time after ovulation varies from person to person, and may also vary due to one's physical fitness and other factors. Therefore, female friends who are preparing for pregnancy do not need to worry too much. Relieving stress and maintaining a good mental state are all helpful for the preparation period.

The first step of sperm-egg fusion is that the couple has sex at the same time and the sperm and egg fuse. The fusion of sperm and egg usually takes about twenty-four hours. The sperm enters the oocyte. When the egg and sperm chromosomes fuse together, this step means the completion of sperm-egg fusion. During the development period, metabolic changes will occur, which nourish the formation of an environment suitable for sperm-egg fusion and prepare for embryo implantation. On the fourth day, the sperm-egg fusion will slowly enter the uterus and then grow there. On the sixth or seventh day, the blastocyst produced by the sperm-egg fusion begins to implant. The completion of embryo implantation means that the test tube embryo has been successfully placed and the creation of a baby has begun.

Embryo implantation usually presents with the following symptoms:

1. The body temperature will drop during ovulation, some lower body bleeding will continue, and some expectant mothers will experience muscle cramps. After the sperm and egg combine and the embryo implants, some female friends will have a small amount of bleeding in the lower body, and may even be accompanied by muscle cramps. Some will also have a little bleeding during the menarche, but this is not menstruation, it is the result of embryo implantation.

2. The nipples will be swollen and painful to touch. After the sperm and egg combine and the embryo implants, the hormones in the woman's body will undergo certain changes, which will cause a feeling of swelling and pain in the breasts. If a woman's breasts feel swollen and painful, it is generally a sign of pregnancy.

3. Feeling tired, sleepy and weak. This is because after the embryo formed by the combination of sperm and egg implants, it will secrete a large amount of testosterone, which causes the patient to feel weak in the limbs and dizzy, as if he has a cold. Women who are very good at getting pregnant often have this symptom.

4. Urinating more frequently. After the embryo formed by the combination of sperm and egg implants, the woman's metabolism will undergo some changes, which will in turn stimulate the woman's body to cause frequent urination, so the frequency of going to the bathroom will increase greatly.

The above are the symptoms that will normally appear after the embryo implants, but in fact these are not certain. The experience and symptoms after the embryo implants will vary from person to person, and are also related to the mentality and psychological factors of female friends. If the menstrual period has not come for ten days, you can use an early pregnancy test to test whether you are pregnant, or you can go to the hospital for a check-up to confirm.