7.5 week ultrasound

So I had my first ultrasound at 7.5 weeks pregnant and babies heart rate was 141. Everything I’ve read says at that point normal range is 90-110... the doctor didn’t seem concerned about it but is that too high? Also the babies amniotic sac was measuring a little small, so I go back in a couple weeks to re check that. Otherwise baby was completely healthy. Anyone else experience that??