It is the Church's preference, that a Catholic be Confirmed before receiving the Sacrament of Matrimony.
Canon Law: "Catholics who have not yet received the sacrament of confirmation are to receive it before being admitted to marriage, if this can be done without grave inconvenience." Can. 1065
What would constitute a 'grave inconvenience' is a matter of interpretation. You should check this out ASAP with the local priest where you are getting married, as some dioceses are very insistent on confirmation before marriage, while others are not.