Question about the doctor

Ona • A heart person with a dark sense of humor.
My Obi said that he won't do the ultrasound with the screen and all until the 20th week. I'm in my last week of the first trimester and I just heard my baby's heart beat today, but I haven't seen my munchkin yet. Is this normal? Or is my Obgyn an asshole? 
This is my first pregnancy so I haven't done this before. Input is very appreciated.