What is the severity of the pain on the scale of 0-10?
Do you have nausea, vomiting, diarrhea / constipation, loss of appetite, bloating, urinary burning or increased frequency, vaginal discharge?
Any specific point of tenderness?
Any significant past medical or surgical history?
Following causes should be considered for this pain;
1) Ovarian torsion
2) Acute salpingo-ophoritis (inflammation of fallopian tubes and ovaries)
3) Acute appendicitis
4) Ureter stone
A watchful waiting can be done for couple of hours to see if the pain abates itself or go mild. But if the pain does not decrease or resolve or at any point of time increases; an ultrasound examination and physical evaluation by a doctor is essential.
Please feel free for your follow up questions.