According to Oxford Dictionaries, when speaking of human development, the term embryo refers to the first eight weeks of pregnancy, while fetus refers to the later stages of pregnancy after eight weeks. The first stages of pregnancy are referred to as the zygote, which is followed by the cells developing into an embryo.
According to MedlinePlus, cells within the embryonic stage begin to multiply and take on specific functions. These functions include creating blood and nerve cells. This process is important, as these different cells and their functions make up what will eventually become a human being with a heart, brain and organs. During the eighth week of pregnancy, the heart beats with a regular pattern, reports the Office on Women’s Health. Embryonic cell growth is fast during this stage of pregnancy resulting in external forms taking shape.
The term fetus refers to the stages of a pregnancy after eight weeks when the cells have formed enough to look more like a miniature human being. The fetus has arms and legs by the ninth week of pregnancy, and the brain and lungs begin to form at this point, according to MedlinePlus. By the 10th week of pregnancy, the fetus has eyelids, ears and other facial features. After the 10th week, the fetal period begins, marking the beginning of the gestational age of a human pregnancy.Learn More
A menstrual period occurs when the uterus sheds its lining, while implantation bleeding occurs when a fertilized egg burrows into the uterine lining. A menstrual period takes place when a woman is not pregnant, while implantation bleeding can be one of the earliest signs of pregnancy.Full Answer >
IVF stands for "in vitro fertilization." It is a medical procedure used by couples who have trouble conceiving or who cannot conceive naturally. American Pregnancy Association explains that IVF is a type of assisted reproductive technology, or ART.Full Answer >
If a woman has an average 28 day menstrual cycle, it is possible for her to get pregnant 5 days after her period ends. According to WebMD, sperm can live in a woman's body for up to 6 days. A woman that has sex five days after her period could still have live sperm when she ovulates.Full Answer >
The American Pregnancy Association defines IUI, or intrauterine insemination, as the placement of sperm directly inside a woman's uterus. This procedure is used to help women who have been trying to conceive for at least one year.Full Answer >