heartbeat in headphones

for christmas i had gotten a gift card to BabiesRUs (thanks bro!) and bought a heartbeat moniter. the package said that you cant really hear the heartbeat until into the 3rd trimester when the baby is big enough. i've been able to hear Caitlin kicking around though and thats been really neat. well, last night for the first time we heard the heartbeat through the headphones. it was so cool. i've heard it for a few seconds at the dr. office with their equipment,but never on my own until now. it was funny cause we listened for a minute or so then she kicked and moved away and it was quiet again. so of course i chased her and found her again! :)