Pregnancy is when female mammals, including humans, carry one or more embryos or embryos into their body. During pregnancy, multiple pregnancies can occur (for example, in the case of twins or triplets). The human embryo is the most widely studied of all mammalian embryos.
The human gestation period is approximately 9 months between the last menstrual cycle and the birth of the baby (38 weeks from fertilization). The medical term for a pregnant woman is genetics, as well as the medical term for a potential baby is the fetus (early weeks) and then the fetus (until birth).
A woman who is pregnant for the first time is called a gravida1: a woman who has never been pregnant is called a gravida0; Similarly, para 0, para 1 etc. are used for how many times a woman has given birth.
In medical and legal definitions in many societies, as a means of simplifying the indication of the various stages of fetal development, the human pregnancy is somewhat arbitrarily divided into three trimesters.
The risk of miscarriage (fetal or fetal natural death) is higher in the first trimester. Fetal development monitoring and diagnosis can begin in the second trimester. Indicates the onset of viability in the third trimester, which means that the fetus can survive if an early birth occurs.
Before pregnancy can begin, a female oocyte (egg) must undergo a process called "fertilization" or generally (albeit incorrectly) referred to as "pregnancy" in male sperm.
In most cases, this is done by the action of ******* *************, in which the male ********** is inside the female, this type of its **** Liberates *. Even if the pregnancy starts with implantation, it is very convenient for the woman to get the date from the first day of the last menstrual period. It is used to calculate the Delivery Estimated Date (EDD).
Traditionally (according to the law used to calculate the estimated delivery date or EDD), human gestation is defined as approximately 40 weeks (280 days) or 37 weeks (259 days) late menopause (LMP). Will be considered. Days from the date of fertilization. However, pregnancy is considered to have reached between 37 and 43 weeks from the onset of the previous *************. Babies born before 37 weeks are considered premature, while babies born after 43 weeks are considered post-mature.
According to Merck, the ideal time for a human pregnancy is 266 days from the date of fertilization. It is 38 weeks, or about 8 Gregorian months and 22.5 days or 9.0 lunar months. Calculated from the beginning of a woman's last menstrual period, the norm is 40 weeks
According to the same forecast, less than 10% of births occur within the due date, 50% of births occur within a week from the due date and approximately 90% occur within two weeks. But it is not clear whether this indicates the calculated expiration date from the initial sonogram or the final ************ (see more below).
Although these are averages, the actual length of pregnancy depends on a variety of factors. For example, the first pregnancy lasts longer than the next pregnancy.
The exact date of fertilization is important, which can be used to calculate the results of various prenatal tests (for example, in a triple test). If the baby feels overdue, a decision can be made to induce childbirth. Expiration dates are just a rough estimate, and the process of dating with pregnancy can be complicated by the fact that not all women have a 28-day menstrual cycle or ovulate on the 14th day after their last menstrual period. Approximately 3.6% of all women give birth on the expected date of LMP and 4.7% on the day expected by ultrasound.
The onset of pregnancy can be detected in a number of ways, including various pregnancy tests that detect hormones produced by the newly formed placenta. Diagnostic blood and ***** tests can detect pregnancy immediately after implantation, i.e. up to 6-8 days after fertilization. Home pregnancy
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