Honey, you will probably not like my answer, but here goes.
In two weeks there's nothing you can do except start a healthy lifestyle, which won't gurantee any weight loss.
Even if you fast for 10 of these 14 day, you wouldn't lose enough to make a difference appearance-wise, but you would greatly damage your health.
For a great look at the wedding - but great clothes, and make sure they're the right size.