So Old Navy is having their stuff-and-save event right now - 30% off online and 40% in stores. I wanted to order a few things while they're on sale. I usually wear a 6/S in Old Navy. Am planning to get a dress to wear for a wedding in October (I'll be 26 weeks). Should I order my usual size, or order a size up? Or should I just wait and find something closer to the actual date of the wedding?