Please help, opinions :(

I went in for my 8 week ultrasound which was my first appointment. The ultrasound showed a gestational sac measuring 6 weeks 6 days which may have or not have a small egg yolk in it. Basically they told me to prepare for miscarriage but we will do another ultrasound in a 9 days to check progress. I have had no spotting whatsoever. Also, lots of nausea in the past week like 24 hours a day. Anyone had anything similar happen with a positive ending? This is our first baby and we are both wrecks now :(