I used to get two of each size (I had to get keep upgrading and had four sizes of maternity bras as I kept getting bigger LOL!). But I used to get one first to try, and after a day or two when I knew that it was comfortable I'd buy another one the same. I wouldn't get more than 2 because you might be like me and have to go up a size (or 2) in another month, or two or three.