My appointment

So I went for my first ultrasound today!!! I'm was super excited and nervous all at the same time... they were measuring and I'm suppose to be 7 weeks 4 days today and I measured at 6 weeks.. but my mom told me I always measured small... HR was 115!! I've spotted a couple time usually dark brown... before my ultrasound I spotted about a nickel size bright red blood(I was suppose to ovulate again this week) went to see my doc and she started talking about miscarriage... I feel fine not doin anything out of the ordinary... if y'all could send prayers or good vibes that would be amazing!!! Thanks ladies!!!