cramping...

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So I'm having some really bad cramps on my left side... when I get up it's not bad but when sit down and I put my elbows on my knees it's hurts so bad!!! And when I move in this position it hurts worse... it's slightly throbbing but idk what to do. I only had cereal this morning and my prenatals and some lemonaide... can y'all help me out on what I should do...? I'm currently at work