Appendicitis or pulled muscle?

I am a 19 year old female, smoker and drinker. I went out to the club friday night and danced on and off for a good 4-5 hours. As we were walking out i felt a sharp little pain in my right side. As if right on top of my hip/pelvic bone in the front. But then it disappeared. A couple of hours ago it came back in the same place. Same low intensity but sharp, nonetheless. I havent had a fever yet, and i hardly ever have an appetite. Could that be a pulle muscle? Yes yes i would call my doctor but its 4am on a Saturday morning, 4th of july weekend, and hospital would be the only option. I do have regular problems with constipation and i was constipated the past 2 days and had a bowel movement this morning if that could have anything to do with it. There was no usual "bellybutton pain" or anything like that. Just started at my hip. Not low enough for ovarian cysts by the way because ive had those before, and its not constant or super painful just a little discomfort when i move a certain way or every 10 minutes. Help?