Can irregular bleeding be a sign of ovarian cancer?

Hello doctor,

My grandmother had a big goiter that she did not get it removed. Later she got a large cyst on the ovary. I mean 8 kg. When she removed it, she found out she had ovarian cancer. She removed it and is healthy today. Now I am terrified that this is hereditary. What do you think? I am so scared for my mother. The doctor told my grandmother to remove the goiter a lot of times, it was huge and she had hyperthyroidism. I have read somewhere that there might be a link to hyperthyroidism and ovarian cancer. I think that the body is trying to tell something when she got all this stuff. My grandmother was smoking for almost 30 years before she got this, and was 55 when she was diagnosed? Do you think it is hereditary? She is the only one in the family with this type of cancer, no breast cancer known in the family.

My mother was on a check before a few days, but she is 44 and has irregular bleeding and has an appointment with a specialist next month. I am terrified. My grandmother had an early menopause and the doctor thinks the same is going on with my mother. If she got the menopause from my mother I think she also can get the cancer? But it is very normal to get the menopause on the same age as your mother, is it? My mother is 44 years, has 4 kids, never tried a smoke. Do you think she is in danger? I also have OCD and terrifying thoughts all the time.