Bump at 20 weeks

I am 10+4 now. I have a wedding to attend at 20 weeks. I don't want to announce. So what do you ladies think I will be looking fat or pregnant at that time. I think it will b cold also in Seattle. I am 107 pounds now. Had the same weight before pregnancy. Height 5'2. And this is my first pregnancy. Have a very small bump now which clothes hide it.