10 weeks.
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about 8 weeks of development. At this stage, the major organs have formed and the embryo starts to resemble a human being.
An embryo becomes a fetus at around 9 weeks of development.
The inner cell mass of the blastocyst is the structure that becomes the embryo. It contains the cells that will develop into the fetus.
A developing embryo becomes a fetus at around 8 weeks after fertilization. At this point, the major organ systems have started to form and the embryo takes on a more human-like appearance.
An embryo develops into a fetus during pregnancy. After birth, the fetus becomes a newborn baby. Embryonic development involves the formation of various organs, tissues, and body structures.
After a sperm fertilizes an egg its referred to as a zygote. Then it becomes a fetus, I believe after the first trimester.