@DottyLS The 'inherited' risk of breast cancer is if 2 first-degree relatives had it.
That means your mum and your sister.
By 'both' grandmothers, do you mean your mum's mum(your Gran) and your great gran?
It's more of an issue if it's at an early age (so the 90 year old wouldn't count as much.)
Even if there is a strong family history, it's still a very small risk.
I really recommend you listen to Prof Michael Baum on this video where he discusses this. https://thebms.org.uk/publications/bms-tv/
He's halfway down the page on the right hand side.
He's an eminent breast surgeon.
HRT and breast cancer: overall risks and benefits
Prof Michael Baum, Professor Emeritus of Surgery and visiting Professor of Medical Humanities, University College London, answers these FAQs: What percentage of women get breast cancer? I went through the menopause last year and have been troubled with ongoing menopausal symptoms since. Would it be safe for me to take HRT? I have a family history of breast cancer, is it safe for me to take HRT? I have been taking HRT for 5 years and it’s controlling my symptoms well. Could I continue taking it? Should I stop because of the risk of breast cancer with HRT? I went into premature menopause in my 30s and have been on HRT for the last 5 years. Should I stop HRT now because of the risk of breast cancer? I have a family history of genetic cancer and my mother had breast cancer. I carry the (BRCA) gene mutation and went into an early menopause after my ovaries were removed. Is it safe for me to take HRT?
If you listen to that and make your own decision, you probably don' t need another consultation unless you want to be tested for the BRAC gene.
Also, the latest research on HRT and BC shows that for 5 years using Utrogestan, there is no added risk (so it only becomes more of an issue with long term use.)
You start the utrogestan mid cycle (but if your cycles are irregular, start it any time and keep to the same DATE each month- that's easier than counting days.)