3 i week of pregnancy

The concept of the 3rd week of pregnancy is very conditional, because the egg is not fertilized. It is during this period that conception can occur (if it did not happen last week, 2nd week of pregnancy), after which the fertilized egg migrates through the fallopian tubes to the uterus, where the embryo is firmly fixed in the endometrial layer and the fetus begins to develop.

3 i week of pregnancy

In the third week of pregnancy, the expectant mother may not feel any changes in her body, while many of the most important processes take place there.


If fertilization of the egg did not take place at the end of the second week, then week 3 – most favorable time for conception. Within 24 hours from ovulation the ovum is found with the sperm in the fallopian tube, with the result that inside the female body can a new life is born.

One or several male sperm cells penetrate into the female egg and merge with it, inside the woman begins to actively develop zygote, a cell containing a complete double set of chromosomes: one from a man, the other from a woman. The gender of the future baby, his eye and hair color depends on the combination of the set of chromosomes of mom and dad.


Zygote begins the active process of division: after three days it consists already of 32 cells, and after a week – of 250 cells, and looks like a hollow ball 0.1 – 0.2 mm in diameter. The cells formed by the division of the zygotes are called blastomeres. All this time the zygote, feeding on its own reserves, moving on fallopian tubes into the uterine cavity to attach to its wall. Also, the process does not stop cell division zygotes, and when the blastomere becomes several hundred, they form blastocyst – this is your future baby, but still in the very early, preimplantation period of development.

On the 7th-12th day of your journey, that is, at the end of about 3 weeks of pregnancy, blastocyst enters the uterus and begins the process of fixing in her mucosa. In shape, it resembles a raspberry or mulberry berry, its size is about 0.2 millimeter.

Of blastocyst cells are formed the rudiments of the membranes of amniotic fluid, in which the child will be located, and the germs of the embryo. The embryo has three layers of cells from which all organs and tissues will develop.

3 week of pregnancy is the first critical period of intrauterine development – the future baby is only trying to settle in the maternal organism, which so far does not perceive him as part of himself, and can join the fight.


The implantation period lasts about 40 hours., and if the process is successful, by the end of 3 weeks the embryo will firmly entrench in a favorable and nutrient medium – the endometrial layer, after which a strong and multilateral connection will begin to be established between the mother’s body and the future baby.

On the seventh day after conception, it is the germ shell cells (chorion) begin to secrete the hormone hCG (human chorionic gonadotropin), which gives the female body a signal to prepare for pregnancy. The amount of this hormone is constantly increasing and in a few days the pregnancy can be determined by passing a blood test or using a pregnancy test.

3 i week of pregnancy


3 week of pregnancy: the expectant mother can only assume and hope that fertilization has taken place successfully and the desired baby develops inside her.

Possible early signs of pregnancy, such as weakness, irritability, nausea, change in taste preferences, engorgement and tenderness of the mammary glands, lower abdominal pain, Many women perceive as signs of an approaching menstruation. And some of the expectant mothers at this time do not show any visible signs of pregnancy.

3 i week of pregnancy

The only nuance that can alert a woman, she feels all these symptoms a little earlier than usual, critical days seem to be in a hurry a little, also during this period scanty discharge pinkish brown or in the form of a few drops of blood.

Similar signals are explained the introduction of the blastocyst into the uterus: its external cells divide, forming blood vessels, and penetrate into the mucous membrane, where they begin to expand rapidly, forming the placenta over time.

From the third week of pregnancy, the hormones estrogen and progesterone begin to be actively produced by the ovaries. As a result of their work during pregnancy, we can forget about ovulation and menstruation.


The expectant mother does not feel any special sensations such as heartburn or appetite, it is worth just stick to a full and balanced diet.

Regular consumption of fruits and vegetables, whole grain cereals, dairy products, lean meat and fish can support the body during the first weeks of pregnancy.

It is better, at least temporarily, to reject the invigorating black coffee, reduce the consumption of sugar, cream cakes and pastries, sugary carbonated drinks, fast food, spicy and fatty foods.

Doctor’s recommendations

Bosyak Julia Vasilievna, obstetrician-gynecologist, reproductive specialist of the human reproduction clinic “Alternativa” tells: “During ovulation, the follicle bursts and the egg enters the fallopian tube. When a spermatozoid is encountered, fertilization takes place, on the second day a zygote is formed, then it is crushed: on the second day, 2-4 blastomeres are observed, on the third day there are 6 to 8 blastomeres, which merge and on the fourth day a morula is formed. On the fifth day, a blastocyst is formed, which takes up to 72 hours to implant (engraftment) in the uterine cavity. During this period, the woman still does not feel anything specific. On the third day after fertilization, human chorionic gonadotropin (hCG) begins to be produced. At the end of the 4th week, a woman may be surprised to find a monthly delay. To establish the fact of pregnancy, it is possible to conduct a pregnancy test for morning urine at home (but in the early stages the test may be uninformative and not show an early pregnancy if it is available) or, most informatively, donate blood for hCG in the laboratory. Passing ultrasound during this period does not make sense. “


If a woman has bleeding becomes intense and copious, this means that the blastocyst failed to consolidate on the wall of the uterus, and the next menstruation began, although a little ahead of time.

This can happen for various reasons, but one of them is the eternal the struggle of the female body with egg as with male cell carrier, which develops inside every pregnant woman.

In order for the human race to continue, the wise nature came up with special fighting mechanism with itself: the blastocyst produces a special immunosuppressive protein, which lowers the work of female immunity and the future baby – the carrier of enemy male cells – gains time in order to hide behind the placenta.

Unfortunately, the embryo does not always survive; there are a number of factors that can provoke a miscarriage in the third week, for example, alcohol use, viral infections, hormonal imbalances (progesterone deficiency), drug use, stress, and


3 week of pregnancy – while there is no need to torture yourself with any analyzes, they are unlikely to show any definite result.

But if you are constantly monitored by a gynecologist, at the end of 3 weeks to show whether a pregnancy has occurred, maybe hCG blood test.

Also in the female body upon the occurrence of pregnancy begins to actively stand out hormone progesterone, which prepares the uterus for embryo settlement and affects the nervous system of the expectant mother, creating the most favorable conditions for the preservation and development of pregnancy. Checking the amount of progesterone in the blood of a woman can also be done conclusion, whether pregnancy has come or not.

Ordinary pharmacy pregnancy test at week 3 it will not show you the real picture, since the gestational age is still too small and even if the level of hCG is rising, it is not sufficient for definitive conclusions.

If you regularly measure basal temperature, then by the end of 3 weeks you can say with maximum certainty about the pregnancy: for more than 3 days in a row the basal temperature rises above 37C.

Ultrasound With a transvaginal probe at 3 weeks gestation, it can show whether the embryo is developing in the uterus or an ectopic pregnancy. Although with confidence it is rather difficult to interpret ultrasound data on such a period.

The best solution for the future mom in the 3rd week of pregnancy is to calm down and relax in anticipation of the pleasant news that the stork has finally arrived to you.


Traditionally, we advise expectant mothers refuse flatly from smoking and taking alcohol, be extremely attentive to the drugs you are taking, and also give maximum attention to your own health: try not to be in crowded places, to protect yourself from communication with ill colleagues and relatives. During pregnancy it is better not to get pets. Walk more, relax, breathe fresh air, try not to get nervous, eat right and be happy that your long-awaited baby already lives inside you.

First month of pregnancy

First trimester of pregnancy

Like this post? Please share to your friends:
Leave a Reply