Joseph Stalin (1878-1953) was the dictator of the Union of Soviet Socialist Republics (USSR) from 1929 to 1953. Under Stalin, the Soviet Union was transformed from a peasant society into an industrial and military superpower. However, he ruled by terror, and millions of his own citizens died during his brutal reign.
Most of the polled obstetrician-gynecologists believe pregnancy begins when the sperm fertilizes the egg. But a minority say it doesn't begin until a week later when the fertilized egg implants in the uterus -- the definition given by the American College of Obstetrics and Gynecology (ACOG).
week 5 the embryonic period begins fetal development three weeks after conception the fifth week of pregnancy or the third week after conception marks the beginning of the embryonic period this is when the baby s brain spinal cord heart and other organs begin to form the embryo is now made of three layers