24 Weeks, 2 Days Pregnant..

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My Stomach Starts Feeling Really Tight &' ThenA Few Seconds Later, REALLY Loose, Almost Feels Empty, Like Its Just A Big Hole There... I Have No Clue Why It Does This, But Its Random... I Also Feel My Stomach Pulsating Sometimes Before &' After It Happens... It Never Hurts, Just A Weird Feeling... Any Ideas?