I'm a 1st semester sophomore math major right now and I'm taking an Intro Topology course this semester. It ended up being harder than I expected it to be and I'm fairly certain that I will end up with a B/B+ (most likely a B+) in the course due to one bad exam. How bad will this look when I'm applying to graduate school (in pure math)? I feel as though I'm a little inadequate because of this. Am I just overreacting or does my concern have any merit?