What is a 4 week pregnancy ? Despite the fact that during this period the fetus is in the very early stages of development, it is possible to identify a large number of changes that occur in a small organism.
When pregnancy 4 weeks is reached, the blastocysts penetrate deeper into the walls of the uterus. At this stage, the formation of amniotic cavities occurs, which are then filled with amniotic fluid.
The fetus at 4 weeks gestation, namely, fetal cells during pregnancy 4 weeks are gradually modified, resulting in the formation of different membranes. From these shells the organs and parts of the baby’s body will “form”. Allocate only three germ layers. The first of them - the ectoderm - serves as the soil (foundation) for the formation and formation of the nervous system, skin, hair and brain. The second - the endoderm - is used to form the liver, gastrointestinal tract, thyroid and pancreas. The third leaf - the mesoderm - will be the basis for the development of skeleton bones, muscles, circulatory system, connective tissue and the genitourinary system.
One of the main modifications that the embryo undergoes at this stage of formation is the formation of a primary strip, from which the spinal cord and brain will subsequently develop. At the 4th week of pregnancy, it is already possible to determine where the body of the embryo and where the head.
What changes are occurring in a woman’s body? At 4 weeks, she may not yet know that she is pregnant, and wait for the start of the menstrual cycle. Nevertheless, time is passing, but there is no menstruation. Appearance also does not produce any signs of pregnancy, at this stage the abdomen does not change. Ultrasound at 4 weeks of pregnancy does not give a definite result. In short, a 4-week pregnancy is invisible to others
What are the first symptoms during pregnancy? The woman has a breakdown and general fatigue, which appears in the intervals between the usual state and good health. Sometimes the condition of the pregnant woman is similar to the state of health with PMS. And here comes the time to start the menstrual cycle, but nothing happens. This means that the fetus produces a special hormone that prevents menstruation. This hormone is responsible for everything that happens in the body of a pregnant woman and is called the human chorionic gomatropin (hCG). At the beginning of pregnancy, the level of this hormone will increase rapidly and reach a maximum already in the tenth week. The hCG hormone is a kind of stimulator of the corpus luteum and favors the production of hormones necessary for the development of the fetus (estrogen and progesterone). At that time, when the system of the placenta and the fetus will be able to independently create the necessary hormonal background, the need for the presence of the hCG hormone will disappear and the level of its presence in the body will significantly decrease.
The presence of hCG in the blood allows tests to show a positive result in determining pregnancy. In order to get an accurate result, it is necessary to use the test after one day of delaying the menstrual cycle (if the cycle is regular). To determine pregnancy, you can take a blood test. Signs of pregnancy can be approximately the same as with PMS: swelling and some chest pain, weight changes, discomfort in the hip area, excessive vaginal discharge, frequent urination, nausea in the morning, mood swings.
It is worth remembering that weight during pregnancy can fluctuate markedly, so you need to be prepared to increase it. It is useful for both the fetus and the pregnant woman herself. Most importantly, weight should increase gradually. Eat right, do the exercises and your pregnancy will be easy!