My baby does not have an heartbeat?

Lucy
Should I be worried when I went to the emergency room because I had a little bit of cramping it's my first child so I'm super worried. I talked to the doctors and they told me that I'm probably having a miscarriage because they do not hear my baby's heartbeat the doctor says that it can't aslo be just that was too early. I was 5 weeks 4 days. They told me to come back on Monday I am super scared should I be?