Are protective for ovarian cancer. So is being on the pill. (my mom had it so I keep track of this stuff)
I would imagine these facts would make it harder to study possible risk increases from fertility treatments. Someone without fertility problems is likely to be pg earlier, and use the pill for bc for longer than someone who spends years trying to get pg and ends up with fertility treatments.
With my family history, this stuff is a concern to me. I still did several ivf's though. For someone without a family history, I think it's something to be aware of, but I don't know if it would have changed my treatment plan.
The problem with oc is there is currently no good early detection test. Yale came up with a multiple protein marker test, but it is not yet FDA approved. I'd keep an eye out for that one in years to come if you are really worried. I wish they'd approve it for high-risk populations like myself at least.