depends how long ago you ate it. if it was between 2-4 hours, it's somewhere in your bowel, unless it contained meat, in which case, some of it will still be fermenting and glogging about in your stomach.
if it was 4+ hours (and your digestive system is healthy, and it didn't contain meat), then it depends whether or not you've had a shit. if you haven't, might be an idea to, in case you either:
a) shit your pants, or
b) are constipated.
if you have had a shit, then it's in the sewerage system somewhere, unless you're completely repulsive and don't flush your lavatory.
anything else while i'm here?