should I be worried?

Callie
Hey guys, I'm a bit new to this. I recently started using a home Doppler to see if I can catch baby's heartbeat. I've watched probably every video for tips etc. many of them have found the heartbeat as early as 9 or so weeks. I am 12 weeks and one day far and I've searched high and low and I can't seem to find it anywhere. Should I be concerned?..