Congratulations!! and welcome!
In regards to your dress... I have a friend who recently got married, and she had just had lap band surgery. So she was losing a lot of weight and it wasnt clear what she would lose by the wedding. She made sure that she got her dress from somewhere that would do alterations right up till the last month, which was really good! Make sure you look around and ask about that... the place she found were really supportive and helpful!