why are the early signs of pregnancy?

Pregnancy carries one or more embryos or embryos by female mammals, including humans, inside their bodies. In pregnancy, there may be multiple pregnancies (for example, in the case of twins, or triplets). Human pregnancy is the most widely studied pregnancy in mammals. A human pregnancy lasts about 9 months during the last menstrual cycle and childbirth (38 weeks from fertilization). The medical name of a pregnant woman is genitalia, just as a medical name for a possible baby is a fetus (in the first weeks) and an embryo (until birth). The first pregnant woman is known as primigravida or gravida 1: a woman who has never been pregnant is known as gravida 0; similarly, the words para 0, para 1 are always used for the number of times a woman has given birth. In many societies medical and legal definitions, human pregnancy is randomly divided into three thirds, as a way to simplify references to different stages of fetal development. The first trimester has the highest risk of miscarriage (natural death of the fetus or fetus). In the second trimester fetal growth can be monitored and evaluated. The third trimester marks the beginning of life, which means that the baby may live if the birth is premature. Before conception begins, the female oocyte (egg) must join, with the male spermatozoon a process called medically called "fertilization", or more commonly (albeit improperly) as "pregnancy." In many cases, this is because of a S E X U A L  act, in which a man ejaculates semen inside a woman, thus releasing her semen. Although pregnancy begins with implantation, it is usually easier to date from the first day of menstruation to the woman. This is used to calculate the Limited Delivery Date (EDD). Traditionally (according to Naegele's law, which is used to calculate the average day of birth, or EDD), a human pregnancy is considered to be approximately 40 weeks (280 days) from the last menstrual period (LMP), or 37 weeks (259). days) from the date of fertilization. However, pregnancy is considered to be a period between 37 and 43 weeks from the start of the last menstrual period. Babies born before 37 weeks are considered premature, and babies born after 43 weeks are considered premature. According to Merck, the process of human pregnancy lasts for 266 days from the date of fertilization. These are 38 weeks, or approximately 8 months of Gregory and 22.5 days, or 9.0 months of the month). The calculation from the beginning of the last menstrual cycle for a woman, is usually 40 weeks (the basis of Naegele's rule). According to the same reference, babies born less than 10% occur on a fixed day, 50% of births within a week of the fixed day, and about 90% between two weeks. But it is not clear whether this refers to a fixed date calculated from an earlier sonograph or from the last menstrual period (see below). Although these are estimates, the actual length of a pregnancy depends on a variety of factors. For example, early pregnancies often last longer than subsequent pregnancies. The exact date of pregnancy is important, because it is used to calculate the results of various birth tests (for example, in three tests). The decision to have a baby may be made if it seems too late. The deadline is only a difficult measure, and the process of accurate pregnancy is complicated by the fact that not all women have a 28-day menstrual cycle, or ovulation on the 14th day after the last menstrual period. Approximately 3.6% of all women give birth on a predetermined day by the LMP, and 4.7% give birth on the day predicted by ultrasound. The onset of pregnancy can be seen in a number of ways, including pregnancy tests that detect hormones produced by the newly formed placenta. Clinical blood and urine tests can detect pregnancy immediately after implantation, which is 6-8 days after fertilization. A home pregnancy test is a private urine test, usually of which you can detect pregnancy for at least 12-15 days after conception. Both clinical and home tests can only detect pregnancy, and can not determine its age. In the postoperative phase, the blastocyst produces a hormone called human chorionic gonadotropin, which in turn stimulates the corpus luteum in the uterus to continue producing progesterone. This helps to maintain the lining of the uterus so that the embryo can continue to be nourished. The glands in the cervix will become inflamed due to the blastocyst, and the capillaries will be encouraged to grow in that area. This allows the blastocyst to receive vital nutrients from the woman. Pregnancy tests detect the presence of human chorionic gonadotropin.