Miscarriage?

Brittiney

So at 5 weeks 6 days, an ultrasound tech told me she believed she saw a heartbeat, today I got a new ob and she said there isn't a heartbeat yet, but should be soon. So misunderstanding between the two different doctors or what?? I switched due to previous stuff from my past pregnancy, and the new OB did the scan herself and said she didn't see a heartbeat yet, but will soon. Can someone give me some advice? I'm freaking out here.