Low carb and strange tummy twinges

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I started a low carb diet less than a week ago. I've been lucky to avoid most of the side effects so far but I wondered if anyone else has experienced little twinges in their bellies. It's not painful. It's almost like a muscle twitch but not quite. It actually reminds me a lot of being pregnant and feeling the early kicks, only higher up. Anyone else have this?

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