Pain in lower back and pelvis

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It's been on and off for days. I've tried a hot bath, Tylenol...sitting, walking, laying and standing. This time it won't go away. On a scale of 1-10 I'm at 8. Should I go in or am I being ridiculous? It's a ton of pain and pressure but no spotting or any fluid. My Dr office doesn't call back so it's not like I can call. This is my 3rd baby and I've never had this before. I'm 32 weeks