When was your last ultrasound?

I am currently 29 weeks and 5 days, my last ultrasound I was at 23 weeks and 5 days. My baby was showing face up with his back turned so his face was towards my spine I didn’t really get to see him. During my last visit 2 weeks ago I asked when my last ultrasound would be and my nurse practitioner said that I will not have another ultrasound unless they are alarmed by something. I’m confused because I thought you get one last ultrasound before you give birth to check the weight and position of the child? This is my first baby so maybe Ive just been misinformed? Still I’m upset because I saw him at the middle of my pregnancy, and I didn’t know that would be my last time seeing him. But I’m curious, is this normal?