First pregnancy Woo hoo!

I'm looking for advice...have any of you had cramps during your first trimester? I'm 6 weeks along and have had some cramping going on, but seems to help when I drink water. 
Reading some articles I was worried about it being an ectopic pregnancy...so I went to the ER, they did an ultrasound, blood work, and urine tests. They said the ultrasound was too early to tell, and my pregnancy hormone was 142. That I should go back in two days to make sure that level is increasing. Idk I'm just worried about my little one. 

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