Is this a stomach bug?

So, yesterday I started to feel nauseated and around 11pm at night it started to get really bad, to the point that I felt like vomiting. Today, I started to feel a little better but still a bit nauseous. I've also experienced abdominal cramps but no vomiting or diarrhea. It's been 24 hours since it started and my appetite is coming back and I feel a lot better. Could this of been one of those 24 hour bugs even though I haven't actually thrown up?