I'm a non carrier within a BRCA 2 family, however prior to the availability of gene testing I was lucky enough to be able to have my cancerbags removed prophylactically at 29, which I fought tooth and nail for, and which really is a much less invasive or risky operation than BSO, as it doesn't involve opening up a body cavity or any endocrine consequences.
I was offered BSO as well which I declined as I didn't want to enter menopause and could reduce my risk of that by half by taking the combined pill continuously for the next 20 years and I pay for private ovarian screening.
I have continued both of these measures despite learning my status, as a negative test doesn't erase the psychological trauma of having watched it rip through your family.
However if I were your age, and known to be positive, also as I believe the ovarian risk is higher in BRCA 1 than 2, I would go ahead with that.
But I would say to anyone having that surgery who doesn't actually have cancer, do not sign the consent form unless and until you have a prescription for estrogen in your possession.
There is no argument for denying a previvor estrogen - with breasts your risk is extremely high anyway, and the additional risk of hormone therapy a drop in the ocean, and without breasts your risk is close to zero, much less than the average woman.