Don't some of you feel like it's nice to still have a right to process your pregnancy w/out the constant lens of IF?
As for your "complaint" though I don't think it's really a complaint so much as a puzzled observation, I'm gaining much faster this pregnancy than I did with my first. I'm only at 14 weeks, but I think I've gained around 8 pounds. I didn't gain this much until around 20 weeks with my first -- gained a total of 30. I probably am eating more than I did the first time, but it's because I NEED to. Different babies demand different things and do different things to our metabolisms. If you were a tad underweight (or on the border) to begin with, your body might be trying to catch up to the demands of building a baby. I know you're not particularly worried, but I'd be questioning, too.
BTW -- I remember my weight gain really speeding up in the middle and slowing way down toward the end, so you may find that will happen to you.