What's the difference between an embryo and a fetus?
Yes, you are correct. You can read the wikipedia article about an embryo:


  An embryo is a multicellular diploid eukaryote in its earliest stage of development, from the >time of first cell division until birth, hatching, or germination. In humans, it is called an >embryo until about eight weeks after fertilization (i.e. ten weeks after the last menstrual >period or LMP), and from then it is instead called a fetus.