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The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.
[4] [5] Heavy vaginal bleeding in the first trimester or bleeding associated with pain, may be a sign of a complication, such as a miscarriage or an ectopic pregnancy, that would need to be assessed by a healthcare provider. [6]
The first trimester includes conception, which is when the sperm fertilizes the egg. The fertilized egg then travels down the fallopian tube and attaches to the inside of the uterus, where it begins to form the embryo and placenta. During the first trimester, the possibility of miscarriage (natural death of embryo or fetus) is at its highest.
Initial sway, total sway, and sway velocity (see figure for description of variables) are significantly less during the third trimester than during the second trimester and when compared to non-pregnant women. These biomechanical characteristics are possible reasons why falls are more prevalent during the second trimester during pregnancy.
Obstetric causes of first trimester bleeding include the following: Early pregnancy loss is a term often used interchangeably with spontaneous abortion and miscarriage and refers to pregnancy loss during the first trimester. [7] It is the most common cause of early pregnancy bleeding and is associated only with heavy (versus light) bleeding. [8]
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .
Most often, nausea and vomiting symptoms during pregnancy resolve in the first trimester, however, some continue to experience symptoms. Hyperemesis gravidarum is diagnosed by the following criteria: greater than 3 vomiting episodes per day, ketonuria, and weight loss of more than 3 kg or 5% of body weight.
Device for obstetric ultrasonography including usage in 1st trimester. Transvaginal ultrasonography of an embryo at 5 weeks and 5 days of gestational age, with discernible cardiac activity (arrow). In the first trimester, cardiac activity can be visualized and the fetal heart motion quantified by obstetric ultrasonography.