12 weeks ** worried

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12 weeks today exactly and couple days ago I had upper back pain for a bout a day since yesterday evening I’ve had a dull pain in my lower back but with no cramping or bleeding is it normal? I seen my baby at 11weeks 3 days and he or she was doing absolutely great and the heart was 168 bpm! Any ideas what this could be? Should I call my ob when her office opens ? *