3 week of pregnancy: sensations, fetal development
Fetus at 3 weeks gestation
At this time, it is still difficult to name a future child as a child. Approximately one week passed since fertilization, during which the fertilized egg moved along the fallopian tube and ended up in the uterus. During this week, the unborn baby is called a zygote. During this week, cells were constantly sharing. First, two cells were formed, then four, then 16, and so on. This process has long been studied. Embryologists and fertility specialists constantly see him in the in vitro fertilization protocols.
During the passage through the fallopian tube, the zygote turns into a morula. And the blastocyst is already entering the uterine cavity. Its dimensions are approximately 0.1 millimeter. And now her task is to attach to the endometrium of a woman. This process, although it seems so small, is one of the most important. After all, if the blastocyst attaches in the wrong place (in the fallopian tube or in the pocket formed after tubectomy), then the woman will urgently need a gynecological surgery.
Unfortunately, about 75% of fertilized eggs do not survive. The following reasons may contribute to this:
- Defects in cell division.
- Violations of the hormonal background in women.
- Diseases associated with endometrium (inflammation, endometritis, endometrial hyperplasia, hypoplasia, neoplasms, etc.).
- Sexually transmitted diseases.
- Infections in the body of a woman.
In some cases, the blastocyst cannot attach to the endometrium without any reason. Therefore, even during IVF, a woman cannot be sure that the pregnancy will definitely come.
If the blastocyst is not attached, then at this stage it is not considered a miscarriage. The woman does not even know that she was practically pregnant, the cells will simply come out of the body along with the menses that have arrived in time.
If everything goes well, then the blastocyst, which is fixed in the uterus, every hour increases the number of cells inside. Moreover, it is interesting that these cells are universal. Any of them can become in the future as a liver, and a stomach and even a skin.
When the number of cells increases to the desired size, the blastocyst begins to lengthen and enters the stage of the embryonic disc.By the end of this week, the disk will curl up and the head will begin to develop at one end, and at the second tail of the embryo.
For a period of three weeks, the organism of the future mother perceives the future child as a foreign body and tries to get rid of it. If the baby overcomes these difficulties, it means that after 9 months a new person will be born.
Feelings of a woman at 3 weeks of pregnancy?
At this time, the future mother does not yet know about the existence of a new life within herself. According to the female calendar until the end of the menstrual cycle is still about a week. And all the possible symptoms of pregnancy a woman can throw on the premenstrual syndrome.
As soon as the embryo is attached to the uterus, the restructuring of the body and hormonal levels begin. As a result, a woman can experience the following changes in her condition:
- Slight increase in overall body temperature. The maximum it can rise to 37.5 ° C. An increase in temperature is associated with an increase in the body's hormone progesterone.
- Due to a hormone surge, pimples can appear and skin type changes.
- Irritability and emotional instability. Possible crying because of any little things.
- Slight pulling pain in the lower abdomen.
- Nausea and odor intolerance.
In addition to all the above, a woman may swell breasts. She can often run to the toilet. In general, the condition is very similar to premenstrual syndrome.
What secretions may appear at obstetric week 3?
Bleeding may occur during the implantation of the blastocyst. The mucous membrane of the endometrium at this point is exposed, as a result of which its integrity is impaired. Vessels at this point may also suffer. Their main difference from menstrual bleeding is the beginning. Attaching the blastocyst occurs approximately 6-12 days after ovulation. And the menstruation will begin only in 14 days.
Also, implantation bleeding is easy to distinguish from menstruation in the following ways:
- The duration of menstruation averages from 3 to 6 days. Implant bleeding lasts only a few hours. In rare cases, their duration can be increased to a maximum of two days.
- The intensity of discharge during bleeding as a result of implantation is very weak. Maybe just a few drops of blood in underwear. Menstruation is much stronger.
- The color of blood at the time of implantation varies from light pink to pale brown.
All of the above is typical for the normal course of pregnancy. If implantation occurs outside the uterus, the following symptoms may occur:
- During implantation, acute cutting pains in the lower abdomen may occur.
- The highlight color turns brown. This is due to the fact that the blood before the exit, passes through the fallopian tubes and oxidizes.
- Severe dizziness and nausea may occur.
In addition to menstruation and implantation bleeding, the emergence of blood from the genital tract can be a symptom of one of the following diseases and conditions:
- Sexually transmitted diseases.
- Injuries after intercourse.
- Vaginosis, inflammation in the uterus and endometriosis.
- Miscarriage in the early term.
- Hormonal impairment.
Therefore, in the case of blood discharge is not in time of menstruation, it is worth contacting a gynecologist.
Can I do a pregnancy test at 3 weeks of pregnancy?
At the moment when the blastocyst is attached to the uterus, the release of a special hormone of pregnant women, human chorionic gonadotropin, begins.It is thanks to him that the first chorions, the villi, appear, which will later become the placenta. Also, hCG affects the corpus luteum so that progesterone is produced. Progesterone, in turn, gives a signal to the pituitary of a woman that pregnancy and ovulation have now come to nothing. This work of hormones will continue until about the sixteenth week of pregnancy. Then the placenta itself can form the required amount of progesterone and the importance of the hormone hCG is lost.
It is possible to determine hCG in the blood or in the urine. Immediately after the attachment of the blastocyst, the hgch is already beginning to appear in the blood. Its concentration is very low, but every 48 hours it is approximately doubled.
In urine, the concentration is much lower than in the blood. Standard pregnancy tests suggest a concentration of this hormone in the urine of at least 25 mU / ml. And such an amount or more will be observed approximately on the fourteenth day after fertilization, that is, on the first day of the delay of the proposed menstruation. If a pregnancy test is made earlier, the indicator may be false negative and will have to be redone later.
In the presence of pregnancy, literally in 2 weeks, the concentration of hCG should be at least 5 international units per liter. And if you donate blood to hCG in a day again, it will double. If the second time the concentration is increased by fewer units, is equal to the previous indicator or decreases, then most likely it is either an ectopic pregnancy, or the blastocyst ceased to develop and menstruation will soon begin.