Ultrasound Jitters.

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I have my first ultrasound ever tomorrow at 8 weeks 3 days & I'm absolutely scared shitless. I feel fine, i haven't been bleeding or having cramps or anything to cause worry. I definitely feel pregnant, but I'm just so worried that they won't find a heartbeat or that the baby isn't growing or something. How did your very first ultrasound go? What did they do?