tailbone is hurting!

Michelle
I've been feeling really uncomfortable on my tailbone/lower back for about a week now. I'm 15 weeks this week. Lying down flat on my back also is pain and my back will lock. Told dr about it today, she said it's my uterus expanding and putting pressure. 
Is anyone else feeling the pain? I honestly can't sit down comfortably and the pain is constant. 
I tried stretches but it didn't feel good or helping. 

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