Thanks for the advice everyone! I went back tonight and tried on the small with black leggings, the way I want to wear it to graduation, and it fit! I actually kept going back and forth between the dresses (medium and small) because my mind has just not caught up with the changes my body has gone through yet!
Anyway, I attached a pic of me in the dress! I am so glad I bought it. It will be great for Christmas/graduation,
and I think it will look even better 10 pounds from now (assuming I lose the 10 pounds from the areas I want to lose them from - which I know never works out, lol). Thanks again, everyone! I knew I could count on you all!