Technically I still have one more required (major) course to complete to graduate on time with my bachelor's in CS. I have no reason to believe I'll fail it, but if I did, it'd throw off all my current plans for the future. The mere possibility of this happening is generating an unreasonable amount of anxiety.
Think of how many other potential things that could go wrong that would disrupt your plans way more. Like San Diego falling into the ocean or something. I'm sure you'll be fine ;-)