One important thing to remember in threads like this: women who are really depressed about their weight gain stop weighing, much of the time. And even the ones that do keep weighing don't post, because they are embarrassed. Which means most everyone who does post is on the low end of the normal spectrum, which makes everyone else feel like even more of a freak.
Personally, I've gained 17 lbs at 21 weeks. It's not worrying me, though, because I'm watching it very carefully, tracking my calories every day, weighing every day, exercising every day. And the rate has really slowed down: I haven't put on any in the last two weeks, for example. So I am hoping I am just one of those that puts their weight on early.
But even if I end up gaining 35-40 lbs total, I don't really mind. I've taken it off before and I can do it again.