Hi Jen, they'll be a lot of things to take into consideration for this decision to be made as every individual heals differently.
I hope this link is of some help to you
Just an update. Talked to friend today - and it is silicone "fillers" for her bra. However, she was reading instructions of the silicone and it said she had to be careful of them if she was to get radiation which she is starting on 19th so that alarmed her too as she thought the breast nurses could have warned her.