My fiancé's sister just found out she's pregnant and it's time for everyone to be ordering their dresses, but she's only 6 weeks so we don't know how much weight she's going to gain and I don't want her to order a dress and it not be big enough, but I don't want to wait till the last minute and her have to pay double the price and take the chance on the dress not being the same color as the rest of my bridesmaids since they aren't wearing the same dress. What do I do? How do I handle it without being a jerk and saying that she's just going to have to order a dress and hope it fits or can be altered to fit?