Pregnant Bridesmaid

My sister is getting married and I have the honor of being the maid of honor! The only problem...I will be 8 months pregnant in February and I need a David`s Bridal size 12 or larger in the color clover. I already bought a dress...before I knew I would be pregnant and we can`t really afford another one at full price. If anyone has a dress that they would be willing to give or sell, please let me know.