Doc couldn't find baby's heartbeat with the doppler today at 12w1d

Meagan

I miscarried at 12 weeks last year so I was very disappointed not to hear a heartbeat today with the doppler at my doctors appointment at 12 weeks with this pregancy. I am scheduled to have an ultrasound tomorrow but I'm scared. Has anyone else experienced not finding a heartbeat with a doppler at 12 weeks?