Pretty soon is a phrase commonly used to indicate that something is going to happen in the near future. However, there are many other words and phrases that can be used to convey the same idea. Some synonyms for pretty soon include shortly, momentarily, in a little while, before long, in the coming days or weeks, in a bit, soon enough, and in due course. Each of these expressions can be used interchangeably with pretty soon to indicate that something is going to happen relatively soon, or in the near future. Choosing the right synonym depends on the context and the intended tone of the conversation or written text.