Dear spec-
110 beats per minute is a completely normal heart rate for a 6 week 1 day gestation. After 6 1/2 weeks (6 weeks, 4 days), the average feta; heart rate increases so that at the next ultrasound a rate of 120 is desired. Even so, babies beyond 6 1/2 weeks with heart rates of 110-120 most often do just fine. The follow up ultrasound that you have scheduled is just precautionary.
The twinges are typical of pregnancy - neither a good sign nor a bad sign.
Everything sounds real encouraging so far!