11 week pregnancy scare

so today we were at my 11 week appt and had to get blood drawn and the usual heartbeat Doppler to finally hear the heartbeat.. because during our first ultrasound the baby was 6 weeks and we couldn't hear it yet. the doctor is searching and searching and couldn't hear the baby. so I think the worst. They run out of the room and grab a ultrasound cart and there she was with a healthy 169hr. Has anyone else had this scare? I was terrified for the worst, still shaken up from it