Any HCG level experts on here? Lol

oh

Little worried after my Dr. Appointment yesterday, my ultrasound showed I was a week behind and the only reason I am freaking out about it is because the last time this happened I miscarried. Dr said not to worry and I just received my blood work results today stating that I was at 30,000 (my HCG levels) according to this app I'm 7 weeks and 3 days. According to my ultrasound I am 6 weeks and 2 days.... waiting on my dr response..but 30,000 sounds good....right?