Have you gained or lost weight?

I'm at 16 weeks and I still haven't gained any weight. I've stayed around 100 lbs the whole time. I'm hoping that I start gaining weight soon and that baby is getting all the nutrients s/he needs. I've always been small, but I feel like my appetite has been good for the last month since the nausea went away. I'm surprised my weight hasn't budged.
How has it been for you? And if this isn't your first pregnancy, how far along were you when you started gaining weight in the past?

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