Doctor isn't helpful.. can someone take me seriously?

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I'm 12 weeks, I told my nurse practitioner that I've been experiencing terrible back pain in my lower back down into my left cheek. She thought it was ridiculous and said it was much too soon to be having back pain.

I told her I have had terrible aching and cramping in my right arm since I first found out I was pregnant, she laughed and didn't say anything beneficial. Its like she doesn't take me seriously.

Does anyone else have any useful information???