I have ovarian cysts and I had extreme gas, extreme bloating, pain after intercourse, the little pinches on one side that you're talking about, and terrible IBS symptoms (already had IBS before the cyst). It was terrible. I, too, was afraid something more was wrong. Ovarian cysts are hardly ever anything to worry about.
That doesn't mean you shouldn't see your gynecologist however. It would be rare for you to have ovarian cancer at your age (I'm guessing you're a teenager, all I could see of your age was '1'), but you don't want to not let your gynecologist keep an eye on your ovary for other things.