What happens during the first trimester of pregnancy?

During the first trimester of pregnancy, there are many changes in the pregnant female body, often caused by overvoltage or pregnancy hormones such as estrogen and progesterone. These hormonal overvoltages are generally considered to be responsible for different symptoms of pregnancy and timely discomfort that a woman can feel. This period also brings many changes and rapid growth of the developing child. For this reason, the first trimester of pregnancy, which is the first 12 weeks, usually counts as beginning on the day of the last menstrual period of the woman. This can actually be two or more weeks before the fertilization of the egg. Generally, during this time of preliminary fertilization, no specific changes related to pregnancy are not specific in the body. These hormones help prepare to support the growth of the child. For example, they play a role in helping to maintain thick lining of the uterus to protect the developing embryo, and in the development of the placenta, a key source of oxygen and nutrients of the embryo.

Further changes in the female body caused by pregnancy hormones during the first trimester often include the growth of the uterus and breasts, increased blood flow and slowing the digestive system. These changes can result in many common discomfort, which often feel in the first trimester of pregnancy, such as fine breasts, as the dairy channels begin to grow, frequent urination, as the growing uterus begins to pressure on the bladder, and constipation, because the digestive system slows more nutrients. In particular, one hormone, called human chorionic gonadotropin (HCG), is generally considered to be responsible for perhaps the most famous discomfort: morning illness. Indeed, these naughty feelings caused by HCG can happen at any time of the day.

The first trimester of pregnancy also brings many changes in the developing child. During the first few weeks of pregnancy, fertilized evolution develops into a small sphere of stem cells and implants into the uterus lining. Stem cells are special cells that areThey can develop in any other kind of human cell. Around the fifth week of pregnancy, these special cells begin to distinguish and create known human organ systems. At this point, the fertilized egg is now called an embryo.

The first organ systems that normally develop during the embryonic stage are the nervous system, including the brain and spinal cord and circulatory system, including heart and blood vessels. They generally begin to evolve during the fifth week of the first trimester of pregnancy. In the weeks of six to eight eight embryo, it begins to develop a head, face, Eyes, arms and legs. Around nine weeks, their fingers, fingers, muscles and bones usually begin to develop. In about 10 weeks, the genitals usually begin to develop.

Generally, the last two weeks of the first trimester of pregnancy indicate the beginning of the fetal phase. During this period the fetus begins to grow rapidly. At the end of the 10th week, most of the fruits are only about 1 inch (2.54 cm) long, but until the end of the first trimester of pregnancy they often tripled to about 3 inches (7.62cm). This rapid growth generally continues to the second and third trimester of pregnancy until the child is born.