Measuring Behind

Hey everyone!

So, I’m 9 weeks 3 days pregnant by my math. I’ve had some brown discharge over the past 2 days. No cramping. I went in for an appointment and the gestational sac is measuring 5 weeks 6 days. They were unable to see baby due to the size. The tech did not seem concerned. But, then my doctor called and feels I’ll likely miscarry. I’m going in for labs tomorrow. Anyone had experience with this when it did not result in a miscarriage? Looking for some support.