Confused, earning a B.S. degree in 4 years?

ok so im in my second year of college, I need just a few more classes before I earn my A.S. degree. But after that do I have to complete 4 additional years of college to earn a B.S. degree, or do I just have to go to school for only 2 more years afters my A.S. degree. idk if im making sense?