sonoline Doppler

I am 9 weeks today and just got a Doppler. I've had 2 ultrasounds and have seen the baby's heartbeat but haven't heard it yet. My next appointment isn't until 12 weeks and I'm freaking out cuz I've never really felt pregnant. I bought this hoping to get some relief before my next appointment. I haven't been able to find the heartbeat yet so I'm just wondering what the earliest you were able to hear yours with your Doppler at home? Thanks!