I don't really think this is a big deal because weight (especially for a woman) varies so wildly.
I don't weigh myself anymore but when I did it was not unusual for my weight to fluctuate from 5-6 pounds in the span of a few days (while not pregnant).
It's easily attributable to water retention, digestion slowing down, etc. Unless you're binge eating, there's really no way you've truly gained that much.