Just wondering

So here is what happened today at my appointment.

I had an ultrasound today and it was my first one and going off the first day of my last period I'd be 7 weeks 5 days, but going off the measurements of the baby I'm only 5 weeks 5 days and there is a heart beat of 110 but I was told that the pregnancy may become non-viable because it's 2 weeks off from the lpm.

So I guess what I'm wondering is if anyone else has been told this and how it turned out.

I'm freaking out cause the nurse wasn't very clear about what anything. I did a blood draw to make sure my hgc levels are going up instead of dropping.