Congrats on the great news Tara!!
99BPM sounds fine to me, as i was scanned at 6wks 3 days, and bubs heartbeat was 101 bpm. Everyday at that early stage, the heart gets a little faster. And by 12 weeks, bubs heartbeat for me was up to 157bpm. The sonographer told me it was fine, so i would not worry, you have had anough to worry about lately without adding to it.
Fingers crossed for you hun that this little bubba is a sticky one, here for the long run