Stomach Pain

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I'm 12 weeks 5 days today and since last night I've been having stomach pains. It's not like cramps really it feels like I'm sick kind of but other than my stomach I feel fine. Also it completely goes away if I lay on my right side or if I'm standing up. But the second I bend or sit or lay on my back or left side I'm in pain. I've also had really bad gas since yesterday so I didn't know if maybe it's just really bad gas pains? Let me know what you guys think. Should I call my doctor or am I overreacting?