By week

4th week of pregnancy


In the fourth week, one of the critical stages of pregnancy takes place – implantation of the embryo. It could happen earlier, it all depends on the individual characteristics of the woman’s body. Imagine that your future baby is now the size of a poppy seed!

Table of Contents

Fetal development in the fourth obstetric week

  • The embryo body consists of ectoderm, mesoderm and endoderm. These are the so-called germ sheets. The ectoderm forms hair and nails, teeth, skin, and the nervous system. Skeletal muscles, blood vessels, blood, sex glands and internal organs are formed thanks to the mesoderm. The inner germinal sheet is responsible for the formation of the digestive tract, lungs, pancreas and liver.
  • The child forms and external organs that create conditions for its growth and development. One of them is the chorion, which will later become the placenta. It is she who will provide the fetus with all the necessary nutrients. The amnion is modified into an amniotic bladder, which is filled with amniotic fluid and throughout the pregnancy is responsible for the protection of the small organism. And the yolk sac will be responsible for hematopoiesis for the first 7-8 weeks of pregnancy.

What other changes are taking place in the mother's body?

During implantation of the embryo in the mucous membrane of the uterus, substances that reduce the mother’s immunity are released into the body to prevent the production of a large number of white blood cells.
In a healthy pregnancy, the secretions from the female genitalia are white or transparent, often have a sour odor. The amount of secretions may increase, which is considered normal, given the hormonal restructuring.
It is also not excluded the appearance of ointment bloody discharge. This is the so-called implantation bleeding. If the discharge is scanty and brief, you should not worry.

What changes are seen in a woman in the fourth week?

But now the first signs of pregnancy in the form of drowsiness, fatigue and mood swings can already make themselves known. More noticeable are changes in the mammary glands, their engorgement and hypersensitivity, may be bothered by nausea, vomiting and dizziness. Early toxicosis – a common manifestation of pregnancy, although not necessarily.
Do not worry if you start to worry about intestinal problems – constipation and gas, it is quite common. Prevention of many problems with the gastrointestinal tract will be the right food and a balanced diet.
Get rid of negative emotions and heavy physical exertion, spend more time in the fresh air, rest and sleep well.
Do not lift heavy weights, refuse dangerous and tiring sports.

If a woman is worried about lower abdominal pain, it may indicate problems with fetal development or a risk of abortion. See your doctor as soon as possible.

If you do not get your period at this time, most women resort to pregnancy tests to find out if they are pregnant. The result is positive if the urine contains chorionic gonadotropin (hCG), which is produced by the chorion. To avoid mistakes when taking the test, read the instructions for use.

Now a little person, your child, is forming inside you. Tune in to the long, but unusually pleasant trembling path of the most desirable period in a woman’s life – pregnancy. This is the time of complete merging on the physical and emotional level of mom and child.

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