I had one at 16 weeks which I assume is similar...
Nothing fancy, but I did get to hear baby's heartbeat (though this varies between midwives - some don't like to check so early). Otherwise a check of my urine, check of blood pressure, check I am doing ok.
We went over my blood test results too which were fine.
So, nothing exciting really, but it is exciting still because it is another reminder you actually are pregnant!