I had a friend who's babys HR was 98bpm & she was really worried too.... all is well though & she has a healthy bub now.
I know how stressful it can be, with my first I had an u/s at 10 weeks & HR was 89bpm (so lower than the "safe" 90-115 mentioned above) & as I drove to a different hospital (about half hour drive) it stopped beating so when I had the next u/s about an hour after the first, bubs heart had stopped. So I have been nervous each time I've been pregnant due to this happening.

I would say your babys HR will be alot stronger in 2 weeks time. 101bpm Sounds good to me! Wishing you all the very best