4. the week of pregnancy is the moment of implantation of a fertilized cell in the uterine cavity. At the moment, the tiny cell is less than half a millimeter in diameter, but it keeps dividing, multiplying and growing. The period from the 4th week of pregnancy to the 8th week is called the embryonic period.

Contents:

  1. 4. week of pregnancy: how is your baby developing?
  2. 4. week of pregnancy: what's happening to you?
  3. 4. week of pregnancy: the most important recommendations

4. week of pregnancy: how is your baby developing?

W4. 7 days after fertilization, the zygote reaches the uterus and starts the process of implantation in its mucosa. The so-called blastocyst implantation process takes about 5-6 days.

The embryo usually implies in the upper back wall of the uterine body, in the mucosa, which is hyperemic and rich in mucus at this point in the cycle.

Thanks to this, they have a chance to nourish themselves with substances in the uterine endometrium - without it, they were not able to survive on their own. The implantation culminates in the division of the cell into the embryo and the part that will form the placenta.

In the 4th week of pregnancy, the embryo develops very quickly - this is the beginning of the so-called the period of organogenesis, i.e. the formation of organs and internal systems:

  • successive divisions of three types of cells take place, which lead to the formation of the nuclei of the human nervous system and the human brain, to the development of the digestive system and the most important organs, and to the formation of muscles, skeleton and circulatory system. This is a very important moment, because at this time possible developmental defects appear, so it is so important not to expose the embryo to the harmful effects of drugs, alcohol or other undesirable factors in the first weeks of fetal life
  • a pregnancy bubble is formed. It is the envelope surrounding the embryo and is approx. 3-4 mm in diameter. The follicle grows as long as no problems arise. It may happen that there is no embryo in it, which means a very early miscarriage caused by genetic defects that prevent the embryo from developing. Typically, such an early miscarriage occurs before the woman even realizes she is pregnant. If, however, everything goes well and the woman suspects that fertilization has taken place, she will succeeda gynecologist in the 4th week of pregnancy, it is possible that the specialist will see the pregnancy vesicle in her uterus on the ultrasound image.
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4. week of pregnancy: what's happening to you?

Although at this stage of pregnancy you cannot yet expect typical pregnancy symptoms, it is worth paying attention to one characteristic signal that may indicate that fertilization has taken place.

In the 4th week of pregnancy, the aforementioned embryo implantation takes place, i.e. implantation in the uterine mucosa.

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You are in the 4th week of pregnancy. This is the end of the 1st month of pregnancy

This process, which takes about 7 days after fertilization, is sometimes accompanied by slight spotting. This is called implantation spotting. that shouldn't bother you.

It can sometimes be treated by a woman as the beginning of an expected menstruation, which, however, ultimately does not appear.

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4. week of pregnancy: the most important recommendations

Don't expect your body to start changing immediately after conception. Watch them carefully though. Your next period is due at the end of the 4th week of pregnancy.

If your period is not coming, you should do a pregnancy test. Also sign up for a doctor, especially if you use NHF medical care. Sometimes you have to wait around 2 weeks for an appointment.

  • Visits to the gynecologist and tests during PREGNANCY

So it's better to book the date in advance. Even if you have not yet confirmed your pregnancy, avoid the risks: do not take any medications, even over-the-counter ones, containing acetylsalicylic acid or ibuprofen, and try to avoid cigarette smoke, i.e. do not be a passive smoker and, above all, do not smoke yourself.

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If you have not avoided tobacco so far, do your best to quit. Research shows that children of smokers are born smaller, weaker, and are more likely to suffer from allergies and respiratory diseases in the future.

  • What are the effects of smoking WHEN PREGNANT?

There is also a greater risk of the so-called cot death. So, for the sake of the baby, it is worth getting used to tobacco, e.g. by using nicotine patches at the beginning in more and moresmaller doses.

  • First trimester of pregnancy
  • 2. week of pregnancy
  • 3. week of pregnancy
  • 5. week of pregnancy

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Pregnancy calendar