Well, it looks like the unthinkable happened. When I finished my first roll I happily went to rewind it, but I felt some resistance immediately upon turning the rewind crank. I spun the crank a little harder and heard something loosen, and I thought I was rolling all my film back into the canister. Later I found out it actually snapped in half.
I went to get the roll developed and they told me only about a 1/4 of the roll was in there. I went back home and opened up the bottom of the camera and there was the rest of my roll. I was certain I loaded it correctly because the shutter button would spin whenever I cocked the shutter. Maybe at some point the roll got loose and I wasn't exposing film anymore.
At any rate, lesson learned and now I know to be more careful loading a bottom loader :/ I tried a method of not cutting the roll, but I guess from now on I'll trim the leader.