Ultrasound #2 today

please send good vibes my way, today is my second ultrasound I should be around 7 weeks, I'm so nervous my hgc was low, and not quite doubling so I was sent for an ultrasound at what should have been around 6 weeks, I measured at 4w 6d (we could only see the sac) but they said hgc was matching what i measured last check of hgc was over 2000 (almost 2 weeks ago) I'm but I'm so nervous I never had this with my first! I'm so ready to get it over with so I know my little nugget is Okay!