I bought a Sonoline B and it came today! I searched a little and was able to hear the same "wooshy" (best way to describe it!) sound that we heard when my doctor found it 2 weeks ago. At my appointment she said the heart rate was 160-170 range & when I'm doing it the highest I got was 132. Could that be right? I didn't think it would drop that much in a small amount of time but this is my first pregnancy. I'm 12w3d now.