Are you a breast cancer survivor who happens to be childless?

I asked my GP a few years ago (long before I was diagnosed with BC) what her thoughts were regarding IVF and breast or ovarian cancer.  Her response was: no evidence but also little research, so she wouldn't rule it out as a possible factor.  And I suspect it could be the same for long term hormonal contraceptive use - I think they took the high dose oestrogen Pill off the market years ago for that reason (but I may be misremembering).