Suddenly Bloated - 9 wks is this normal?

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I had just been thinking how flat my stomach had been and suddenly today at 8wks 6 days my stomach seems enormous and very uncomfortable. I actually looked pregnant in my dress today - could it be something I've eaten, something wrong or just totally normal? I guess it's bloating not the baby this early on.... what causes bloating and does it go back down? Anyone else the same?