So I went ahead and bought a doppler. It arrived on Saturday, and I tried for 10 long minutes to find that little heartbeat on Saturday night, but no luck (and poor harassed baby)!! Well, I tried this morning and within 15 seconds of putting that doppler on my belly I heard it!!! I was able to listen to that little hearbeat thumping away for a good 25-30 seconds before the baby moved and I lost it. It was chugging along at about 155-160 - perfect! Wow, there must have been quite some growth in the past 2.5 days. It's crazy the difference just a couple days can make this early on. Anyway, thought I'd share.