You shouldnt be worried for the missing period because this is from anxiety
You should be happy because accumulation of stress cause hormonal
imbalance -irregular periods-hormonal imbalance and in this way you create a vicious circle.
For the ovarian cancer
you should take in your consideration because women who have mother,sister of cancer have increased risk of ovaries cancer(3 folds) i this way you should learn about the prevention.
Take care of your self