What is “baby bloat” ?

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I keep seeing posts about “baby bloat” can someone explain this to me? I have celiac disease so I have been very familiar with “bloat”. This does not feel remotely the same. I am not gassy nor do I feel gross like I do with normal bloat and my bump doesn’t look like bloat. It looks like I’m pregnant and it’s been gradually growing. I am almost 8 weeks. Can someone explain this to me?