First us dated me a week back

april

I was spotting last week so I went in for a ultrasound yesterday I was supposed to be 6 weeks and 3 days. Instead it said I was 5 weeks 3 days and no heartbeat could be seen yet. The lab drew the wrong kind of hcg test. So I have to do that today and now I'm scared I'm miscarrying. Has this happened to anyone else? I still have symptoms . The waiting is killing me.