5w 6d heartbeat

I had my first ultrasound appointment today (based on my LMP I am 6w 4d) however, I've known from the beginning that I ovulated later than expected. My fetal age is measuring at 5w 6d (so about a 5 day difference). The ultrasound was awesome, I saw my little blob and also saw the heartbeat flutter. The heartbeat measured at 105 which the US tech told me was normal, and the nurse I met with started off by saying it was "low" but that would be if I was the actual gestational age, but for fetal age I'm right on track.

I know that I should focus on the positives but this is my first time doing this and I've found I'm focusing on the fact that it could be low. I go back next week to complete the big long appointment and also get another US. Does this heart rate seem okay?