Scared to death

La

I had my first prenatal appointment today and they couldn’t find the heartbeat the doctor said because the baby is still so small … I’m 13 weeks and 5 days .. I did have an ultrasound when I was 8weeks 5days it was hard to find the heart beat with the doppler but we did see it on the ultrasound.. I’m going for an ultrasound tomorrow but I’m literally scared out my mind right now and can’t stop crying