Home Doppler

Okay, I had a appointment Tuesday at 11 weeks 3 days and found the heartbeat and everything sounded great.. the next day we found it on our home Doppler.. now three days later, I can’t find it. To clear my mind, I made a private scan for tomorrow.. but I’m just wondering if I’m possibly worrying for no reason? If this has happened to anyone else? I’m just praying my baby is okay in there.