Awww hun.
When u c ur surgeon he will ask you wot u want from the BA… wot size u wud like to achieve and what you want.
He measures you and talks to you about the procedure and advises you.
He will also tell you wot size implants he recommends and discusses this with you.
Its nothing to worry about hun…..he usually gives you a few sizes to choose from.
Just be honest on wot you want, big, fake look, natural look, ask whether u can have unders or overs…