Question about the doctor

oona • Girl mama waiting on #2 ❤️
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.