Still haven't seen my OB

So I was supposed to have my first appointment today, I'm 11 weeks and 4 days, but when I went in I found out that my doctor had to go deliver a baby. I was a bit upset because I really want to hear my baby's heartbeat and possibly see him or her. Luckily they said they could get me in next Thursday instead of waiting for the next available appointment that's in 4 weeks! I asked the nurse that I spoke with if I would be getting an ultrasound next week and she told me that ultrasounds are usually done at 20 weeks but that they have a Doppler machine so that we could hear the heartbeat. I'm really confused though because I've seen some ladies post pictures of their sonograms as early as 9 or 10 weeks. Do you get a sonogram with the Doppler? I thought those were given with an ultrasound