since your upt is negitive , and usg scan showed a cyst in ovary most probably , it could be simple ovarian cyst
most common complaints will be lower abdominal pain
fullness or bloating
pain with sexual intercourse
urinary frequency or difficulty with bowel movements (because of pressure on adjacent pelvic anatomy)irregular periods
There is nothing to be worried about , its a very common problem , but please visit a gyne for further evaluation.