5 weeks 4 days. Uterus aches

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I feel like AF is about to come full force. It’s not severe pain but it’s that type of quivering deep pain that makes you feel sick to your stomach. I’m starting to get worried that there won’t be a heartbeat at my first ultrasound that isn’t scheduled until I’m 9 weeks. I just don’t feel right. What should I do? Is this normal or not.