Ovarian cysts? or Pregnancy?

You're right, there's no chance of these symptoms being related to pregnancy. That doesn't mean you couldn't be pregnant if you didn't use protection. Leaving that thought aside, you're symptoms sound more like appendicitis. Have you had any pain around your navel? Appendicitis pain starts at the navel and then shifts to the area of the abdomen just above the right pelvis. If you haven't used protection, and your partner is sexually promiscuous, get yourself checked out for STD. Any pathology in the ovary won't suddenly happen, unless your ovary has twisted (the condition is called torsion.) Whatever the cause, visit a health care provider rather than worrying.