Lower left abdomen pain?

I'm a 21 year old female and I've had a sharp pain in my lower left abdomen for a few weeks now. It started after running a few miles and It's come and gone and would flair up during any kind of physical activity from climbing stairs to working out but even a cough or a sneeze would make it hurt. Today however it go to the point where I was in tears, I was at a jujitsu class and while grappling with someone it got so bad i fell to the ground instantly. I left class came home and have been taking it easy but the pain hasn't faded. I have a doctors appointment on Wednesday to get it checked. My only questions right now are should I wait until my appointment, or should I go to the urgent care center and what the hell could this be.