At home Doppler

Victoria • Married 10 years. Mommy to James and Jack 💙 pregnant with #3 due October 24th

I’m 11 weeks 5 days today and I borrowed my bosses at home Doppler that she bought. (She had multiple miscarriages and bought one to ease her mind) anyways I can’t find the heartbeat on my own and I’m wondering if that’s not a good sign or if it’s just too early? I went to the doctor this past Monday and saw baby on the ultrasound moving around but I’ve had a miscarriage previously also so I’m nervous.