J&J, I can see it!
So sorry, Turtle. FX for more than a turkey in your oven come the end of the month!
Bing, I just went through bridesmaid dress sizing issues this past March. I was losing tons of weight and couldn't decide which size to buy. The seller and seamstress told me that a dress can be brought in as much as three sizes, but not let out very much at all. I would stick with the 14 and high hopes that you'll need it come wedding time! You can always have it taken in to a 12 and no need to pay for 2 dresses. Breast size seems to change at different times for different women. My SIL who is about 22 weeks right now got her expansion right away (and quite an expansion, but she was large to start with). Others I know, myself included, have gotten theirs after the birth. As far as the waistband, there is no way to know. It will all depend on how you carry. I know none of that sounded concrete, but my best advice would be to get the 14 and know you'll have some alterations either way. Find a great seamstress (word of mouth is best).
Emilie, are you going to test soon? My CM was a clearish, yellowish color but I have that same gushy feeling and definitely wear a pantyliner because of it. I've read though that some ladies get that before AF. If you don't normally, maybe it is a good sign. FX for a positive soon!
Ugh - my son has some stanky feet and my super nose is not liking it!