We're at 13 weeks today - almost out of the first trimester. I think technically, we're out of the first trimester halfway through this next week (this weekend, I guess).
Our babies are supposed to be about 3 inches long now. BabyCenter.com says the twins are the the size of medium shrimp. WhatToExpect.com says that our babies are the size of peaches. I like that... my little peaches. Maybe they're Georgia girls!