So Tuesday afternoon I was in school and I was walking down these steps (only 4-5 steps) I missed the step and fell, I stood up all I had was a scrapped knee. The next day I get this random sharp pain on my left side where the top of your thigh is but to the side. That was wensday I felt it, Thursday I was fine but I food poisoning and passed gas but today I can't since I'm at school. Any advice what it could be? I think it's built up gas from today or I have have pulled something. My period is also coming too, Thanks