In the current scenario, I would advise you to go for a trans-vaginal sonogram to exclude any local causes for the amenorrhoea. If you are not pregnant, and as your hormonal
profile is normal, then the cause for the delayed period could be inadequate ovarian function as you have only one ovary left and owing to your age, the ovarian reserve
of your other ovary is also likely to be less. Please maintain a healthy weight and a healthy diet and do some regular exercise. Good luck.