My esthetician suggest a 0.5ml top up of Juvederm in my lips. Would 1ml be too much?

I got 1ml of juvederm in my lips at the start of september. I feel that my lips have become a lot smaller since then. My aesthetician said i only need 0.5ml of a top up when i go back which will be in three weeks time but im thinking of asking for a full ml but im not sure if my lips will be too big then?