What's the earliest you heard the heartbeat?

I have a Doppler and I think I was almost 9 weeks when I first heard the heartbeat with my last pregnancy. I seemed to be pretty good at finding it quickly. But I'm only 7 weeks and 2 days and have had so much concern this pregnancy and I seem to be 10x more nervous and was wondering how early were you when you found the heartbeat? I've had a little spotting today but cramping for the last week. I just wish I could hear that little heartbeat to make myself feel better.