3 week of pregnancy

Counting 3 weeks of pregnancy in obstetrics goes of the first day of the last menstrual bleeding at the woman.

Fertilization

On the 3rd week of pregnancy the ovum finally ripens in an ovary follicle, the follicle bursts, and the ovum gets into an abdominal cavity. In close proximity to an ovary fimbrias (fimbria) of a uterine tube are located. They constantly make oscillating motions towards a pipe gleam, entraining an ovum. During its advance on a uterine tube there is also a fertilization.

Fertilization makes one of spermatozoa most of which quicker reached a uterine tube. Most often it happens in department of a pipe which is called an ampoule.

As a result of merge of men's and female sex cells the zygote is formed. Thanks to sokratitelny waves of uterine tubes it continues to move ahead to a cavity of the uterus.

In several hours the zygote begins to share, without increasing in sizes. Thus after the first division 2 cells which are called blastomeres are formed. Days later the zygote already consists of 4 cells which continue to share in a geometrical progression. For three days the blastula becomes similar to berry of blackberry or a mulberry, and at this stage it is called a morula (that in transfer is meant by "mulberry"). Future fruit on the 3rd week of pregnancy only 0,1 mm in size.

On the 3rd week of pregnancy of change occur and on site the burst follicle in an ovary, the so-called yellow body is formed of it. This "temporary" hemaden received the name because of color of the cells. The yellow body synthesizes female sex hormone progesterone which promotes pregnancy preservation.

If there is an implantation of fetal egg in a uterus wall, the yellow body remains until until its function is undertaken by the created placenta. If implantation is not done, in 10 – 12 days it is exposed to involution and disappears, turning into a whitish body. Performing ultrasonography on the 3rd week of pregnancy allows to see a yellow body in one of ovaries.

By the time of the termination 3 weeks of pregnancy, for 6 – 7 day after fertilization, a blastocyst try to be attached to a uterus wall - the implantation stage begins. It is very important period, it call still critical. If everything passes successfully – pregnancy remains and develops further, but the risk of its interruption is high at this particular time to what bloody allocations on the 3rd week of pregnancy can testify.

Changes in an organism on the 3rd week of pregnancy

Hormonal shifts have an effect the first changes in health of the woman. Sometimes they are expressed more weakly, is sometimes stronger – everything depends on their value judgment and degree of sensitivity of an organism. Before all those who planned pregnancy and wait for it approach begin to notice them.

Appetite – it changes either amplifies, or vanishes, or selective addictions to this or that product appear. It is possible to suspect approach 3 weeks of pregnancy on the basis of insuperable thirst for some exotic food, for example, to all acid or to dry macaroni, and here to meat quite often there is a disgust.

The hormonal splash changes also an emotional background of the woman – she becomes whimsical, quick-tempered and whining. The nervous system thus lets know that it is ready to formation of a dominant of pregnancy.

Changes affect also mammary glands – they nagrubat, increase in a size a little, nipples can darken. Allocations on the 3rd week of pregnancy which sometimes happen from nipples are also caused by a hormonal background.

If on the 3rd week of pregnancy the stomach hurts – it can be both a symptom of implantation of an ovum, and threat of abortion. In case of the begun pain abortion on the 3rd week of pregnancy often are followed by bleeding.

Inspection on the 3rd week of pregnancy

The stomach circle on the 3rd week of pregnancy does not change as term still too small. Blood tests on sex hormones will be indicative – progesterone level more than twice increases, and also it is possible to find a chorionic gonadotrophin. The test for pregnancy on the 3rd week can show slabopolozhitelny result.

When performing ultrasonography on the 3rd week of pregnancy in a cavity of the uterus it is possible to find fetal egg at an implantation stage in its wall. The fruit size on the 3rd week of pregnancy absolutely small therefore performing ultrasonography on the device of an expert class will be more informative.