should I get 2nd opinion?

Ta
According to this app I will be 6 weeks tomorrow, I had 2 ultrasounds one last Wednesday where they said they only saw the gestional sac and one today they saw the sac and yolk no fetal pole or heart beat.  My dr office keeps telling me it is too early and that I just need to wait.  I feel like they are not telling me something and they are getting my hopes up for something they know isn't viable. I keep seeing posts people seeing heartbeats earlier or same gestation as me.  The ultrasound tech said I was measuring 6 weeks 5 days. They won't see me again until 3/15. I am just so annoyed with everything and don't know how I am going to function until 3/15. Any similar stories with positive outcomes?