this could be due to a couple of things.
1. it could be a mild self limiting
gastrointestinal infection which wouldn't need more than keeping yourself well hydrated
2. if it's more on the right side, it could be
appendicitis in which case you would need to get yourself evaluated by your physician who would be in a better position to decide whether to put you on antibiotics or go for surgery
3. it could be due to UTI or stones in which case the pain is severe and sometimes associated with burning micturation or increased frequency. this would require a urine analysis and a KUB after which a decision for your treatment could be made.
4.if your a female this could be due
ovarian cyst or a number of uterine pathologies, for which a detailed history as well as work up is required to reach the diagnosis.
watch your symptoms, if the pain goes away, nothing to worry about, it was probably some self limiting cause, but if your symptoms persist or increase in severity or new symptoms arise, you should visit your physician