different periods of pregnancy occur in different ways, each of them has its own characteristics.That is why all pregnancy divided into three periods, or trimesters: I trimester - from the time of conception to 12 weeks, II trimester - 12 to 24 weeks and III trimester from 24 weeks before birth.
I trimester of pregnancy (from conception to 12 weeks)
Under the influence of new conditions associated with the development of the fetus in pregnant women undergoing complex protective and adaptive changes.Restructuring functioning of the body is regulated by the central nervous system with the active participation of the endocrine glands.
After the introduction of the embryo in the lining of the uterus in a woman's body begins to actively produce the female sex hormone progesterone Progesterone - norm and pathology , under whose influence the developing fetus and there are changes in the mother's body to 9-10 weeks of pregnancy, then the ovariesceases to develop and hormonal function assume
period of fetal development is conventionally divided into the embryo (the first 8 weeks of pregnancy) and fetal (9 weeks of pregnancy before graduation).In the embryonic period, there is a bookmark tissues and their division into separate species, and in the fetal - fetal growth, the development of its organs and functional systems.
Under the influence of progesterone change breasts: they swell, lifted nipples, areola (the area around the nipple) darkens and expands.Constipation is the period of pregnancy are also associated with progesterone - it relaxes the smooth muscles of the small and large intestine, which reduces its motor activity.To worry less constipation, you need to drink more fluids.
Often in early pregnancy women are concerned about nausea and vomiting caused by hormonal changes in the body.By the second trimester, these phenomena are usually, but not always, sometimes they continue throughout the pregnancy.
During this period, the woman gets tired very quickly, such a state is held only for the second trimester of pregnancy.This is due to increased consumption of energy to rebuild the body.During this period, better sleep 9-10 hours per day.
first trimester of pregnancy can occur from complications such as miscarriage and ectopic pregnancy.
Ectopic pregnancy - a condition in which a fertilized egg is implanted in the uterus is not, as elsewhere, for example in the fallopian tube.With the growth of the ovum body is broken and there is a strong bleeding.Therefore, ectopic pregnancy Ectopic pregnancy - Fatal dangerous - it is an emergency, which requires surgery.
In the first trimester may be a situation where the pregnancy, but the embryo is no heartbeat.This is called a non-viable pregnancy, it will not develop.In this situation, it proposed scraping Scraping - heavy and unsafe procedure uterine cavity with the laboratory study of the material obtained.
II trimester of pregnancy (12-24 weeks)
FPS hormones have the most diverse effects on a woman's body: regulate water-salt metabolism (but cause sodium retention, ie contribute to the emergence of edema), increased volumecirculating blood, promote the growth of the pregnant uterus, mammary gland, and so on.
Since progesterone is no longer affects the body, it passes nausea, vomiting.In the middle of the second trimester, a woman begins to feel fetal movements.From the breast may appear yellowish discharge - immature milk or colostrum.Constipation in the second trimester may increase, there is heartburn, as the gastrointestinal tract is pressed by the growing uterus.
during this period is the formation of the fetus and the continuing restructuring of the female organism.Complications second trimester of pregnancy - miscarriage Miscarriage - why you lose the most precious thing? (late miscarriage), bleeding (usually a reason - placenta previa), iron deficiency anemia, lack of oxygen (hypoxia) of the fetus.It is important that in the second trimester the fetus is well supplied with oxygen, because in this period is very rapidly developing brain.The fruit is very responsive to the lack of oxygen: it changes the nature of the movements, the frequency and heart rate.
III trimester of pregnancy (from 24 weeks before birth)
In the third trimester is rapidly growing uterus, fetal movements are increasing, sometimes there are fights that last for about a minute and can be terminated with a change in body position.These contractions contribute to the promotion of the fetus closer to the birth canal, so fear them not.But if such fights occur frequently (several times per hour), then you need to see a doctor.
increases the frequency of urination as the uterus compresses the bladder stronger.Shortness of breath - chest organs are compressed, and the body and the woman, and child needs enough oxygen.Most worried about fatigue and sleep disorders - affecting a large physical and emotional load.
During this period of pregnancy may be certain malformations and tumors.Often, due to the general state of pregnancy (eg, late toxicosis) violated the uterine blood flow in vessels and vessels of the placenta and umbilical cord.Such changes can lead to impaired growth and development of the fetus, its hypoxia, which means that there will come a delay of its development.
During this period, identified as malposition, need to know about that in advance, as this determines the tactics of delivery.
All changes during pregnancy to notice and explain the obstetrician-gynecologist, who all pregnant women should be monitored regularly.