Or...you can buy the 12's if you like the style and take them to be altered - most dry cleaners and / or malls are able to alter.
I find that in some jeans, I'm a 16, others are a 14. I wouldn't get set on a particular size, once you reach your goal, you will love how you look, regardless of the # that's on your jeans.
Great job on being so close to goal!!!