Congrats Lil Charlie!
Something tells me its this part, cause thats the first thing it came to my mind when I opened this thread!
IM THE PAPI!
You can rent online one of those ultrasound heartbeat monitors for pretty cheap. We listened to our daughters heartbeat for most of her 9 month gestation. It was very conforting and helped us bond as a family before she ever came out. I remember that time very fondly. I have it recorded to a .wav file...on my iPhone.