Weight gain?!

Rosa
So, had a check up with my Doctor today (I'm about 9 weeks), and she says that I've gained 13 pounds since my last visit when I was about 4 weeks and that was A LOT of weight...huh? First, I don't look nor feel like I've gained remotely close to that. My clothes still fit normally and everything. I'm SUPER bloated right now and my doctor found it hard to believe that being bloated would cause that amount of weight gain....I'm irritated and concerned now. I haven't been eating crazy or anything like that. Anyone else have this issue now or with other pregnancies?