Fourth week of pregnancy

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Future child

Height - 0.36 mm wide and 1 mm long, weight - undefined.

By the end of the week, your unborn child is an elongated embryo with dimensions of approximately 0.36x1.0 mm. This means that if you compare it with the letter "o" in this text, then it will be less than half of it.

During this period, the final implantation of the ovum into the uterine lining occurs. This process began at the end of last week, and now the small embryo begins to form the rudiment of the placenta, which will transfer nutrients from the mother's body to it.

Amniotic fluid is also formed - i.e. the environment in which the fetus is formed. It is located in the placenta between the embryo and the walls of the fetal bladder. Now this liquid is still very small - just a few drops. But by 12 weeks it will be about 100 ml, and by the end of pregnancy - up to a liter.

The body begins to release the hormone hCG (human chorionic gonadotropin). All pregnancy tests are based on detecting an increased content of this hormone in the mother's urine or blood. The fertilized egg turns into an embryo. It develops three groups of cells.

The ectoderm will become the basis for the formation of the baby's brain, the misoderm will form his blood, skeleton, muscles, genitourinary system, and the endoderm will form the glands, liver and gastrointestinal tract.

Modern devices allow you to see the tiny head of the future baby - it is already almost formed and resembles a droplet. Cells have already emerged that will form the future heart of the child and the circulatory system.

You can also see the corpus luteum - this temporary gland feeds your baby until the placenta is formed. It is interesting that the role of the corpus luteum is still not completely clear to doctors. It is believed that it produces progesterone, a hormone necessary during pregnancy, and also maintains the existence of the baby until the placenta is formed at 8-12 weeks.

However, there are cases when the corpus luteum was removed at the earliest stages of pregnancy due to surgery on the cyst. However, these pregnancies ended normally.

Future mom

Are you pregnant or not now can only show a blood test. An analysis of test strips that are sold in a pharmacy most likely will not give any result - the hCG content in the urine is still too low. But if you want, you can carry out such tests daily.

Then you will be able to observe how, at first, a completely pale, barely distinguishable second strip begins to appear, how then it will become brighter and brighter - after all, the amount of the hCG hormone doubles every day.

You may experience mood swings, unexplained irritability, and fatigue. Some women even show the first signs of toxicosis - this is the beginning of the work of the corpus luteum. The main danger of this period is improper implantation of the embryo.

If the ovum does not enter the uterine cavity, it is fixed in the fallopian tube or ovary. Such a pregnancy is called ectopic and is not viable. However, it can rupture the fallopian tube and cause bleeding, which is extremely life-threatening for a woman.

The reason may be congenital defects of the fallopian tubes, previous infections (both sexually transmitted and associated with intrauterine contraceptives), leaving scars on them, surgical operations on tubes or nearby organs. Due to scars or overgrowth of endometrial tissue, the ovum cannot enter the uterus and, as it were, gets stuck in the tube. But some ectopic pregnancies develop for no apparent reason at all.

Statistics show that there is only 1 ectopic per 100 pregnancies. If a woman's previous pregnancy was ectopic, then the risk of the next ectopic pregnancy increases to 10%. Every woman needs to know its signs.

1) Pain that looks like inflammation of appendicitis or very painful periods. If the fallopian tube ruptures, the pain suddenly becomes very sharp and severe.

2) bleeding preceded by pain. However, bleeding itself can occur in normal pregnancies, with 75% of women who have bleeding give birth to healthy babies. However, if bleeding is accompanied by sharp pains, this is in any case a reason to urgently consult a doctor.

3) analysis of hCG. In normal pregnancy, the hCG level in the blood doubles every day. With an ectopic, this dynamics is impaired.

4) ultrasound data. From the fifth week, the embryo is already visible in the uterine cavity. In the event that the hCG test is positive, and the embryo cannot be seen on ultrasound, a more thorough check should be done.

5) severe pain during gynecological examination, when the cervix is ​​affected.

6) nausea, vomiting and dizziness, which is accompanied by sharp pain and bleeding, especially if the blood has a bright red tint.

The sooner an ectopic pregnancy is detected, the greater the chances of keeping the fallopian tube and the possibility of getting pregnant later.

3 weeks - 4 weeks - 5 weeks

Watch the video: Building a baby: The first two weeks

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