Jesse, flip the bike over and turn crank slowly while your ear is close to the chain/cog...do you hear a squeak? Then do same thing, only at chainring end...do you hear it then? I've noticed on mine that when I have chain just a tad too tight I'll get the squeaking. I'd rule that out before worrying about BB - when it gets close to being toast you'll have noticable roughness/resistance and prob some side-to-side play as well.