First doctor appointment

Gesma • My name is Gesma and I'm 27 years old. This is my 3rd pregnancy. I have 2 girls.
I had my first appt today and was disappointed. My first US stated my due date is 3/12/2016 and my second US says 3/08/2016. So I figured I get to hear my baby's heart beat today but the doctor stated its too early. I have to go back in 5 weeks. I'm super disappointed