I got kidney stones when I was pregnant with my son. After dealing with 8 weeks of mystery pain and several ER trips, they doctors finally decided to do an ultrasound on my kidneys. They found five 3-5mm kidney stones (bilateral), two on one side and three on the other. They passed before I gave birth without lithotripsy, but then returned a few times since, seemingly due to different foods.
I detail my journey more here: