Not necessarily. There are a couple of models of the very early universe, and all of them are compatible with the Standard Model of particle physics. (They had better be!)
Guth's idea (inflation) was motivated by a desire to explain the "flatness" problems of cosmology (comprising such apparently unconnected problems as why different parts of the universe look so thermodynamically similar, and why we don't see any magnetic monopoles). The notion that the universe could have arisen out of essentially nothing was a surprising consequence of his solution.