Anybody any advice or stories/experiences on home dopplers?

Bought mine a week ago for peace of mind and testing it out next week as soon as I get back home from holiday. Been ups and downs from the symptoms and those times that I don't feel any symptoms my mind and dreams at night go crazy so I bought it. But my hubby's concerned that when/if we don't find a heartbeat that that would add to the concern and worry sometimes. Is it worth using? I'm 11w3d today. Started loosing symptoms at 8 weeks. Had two doc appointments so far with a healthy heartbeat of 165bpm almost 3 weeks ago.