Most (but not all) LSA majors can allow you up to your second semester of sophomore year to decide what you wish to major in without the risk of delaying graduation. Not everybody is required to take calc. I know many psych majors who chose their major to avoid having to take calc.
If you do end up delaying your graduation by a semester or a year, it is no big deal with regards to how it is viewed in the eyes of employers and graduate/professional schools. However, you would need to consider your ability to pay for that fifth year or beyond.
The links @wayneandgarth provided you are useful for helping you understand what is required for your degree. At this time, all of that may seem like jargon to you, but you will get the hang of it after orientation (i.e., after you register for classes). Of course, feel free to ask if you have questions regarding how to understand the content.