lady cancer????

Bethany
So for the past two months I've been having occasional sharp pain in my right ovary. I thought that it might be the beginning of ovulation pains, but it's continued and always in the right ovary, not switching. My mom had a baseball sized cyst removed from her ovary ten years ago, so she's worried it's the same thing. My periods have been normal, and all pregnancy tests have been negative. I'm scheduling an ultrasound for this week, so they can check for any growths on my ovary, but I'm freaking out until then. 
Has anyone had experience with cysts?