(Update to earlier post)
The nurse finally called and said while things look okay for now, they are a little concerned about the heart rate being low at 90. According to lmp I'm 6w5d, I'm pretty sure I'm 6w1d, and I measured at 5w6d at this morning's ultrasound. From what I've read, 90 bpm at 6 weeks can either be considered normal or be an indication that miscarriage is likely (thanks, google). I'm having a followup u/s next week.
If you had an early ultrasound, what was the heart rate at 6 weeks?