When will I get another ultrasound!!

So I only got one at 8 weeks (when I found out I was pregnant) and one at 12 weeks but besides that , I've gotten the 20 week anatomy scan and havent gotten any since 😔 I heard somewhere that they do another one at 30 something weeks to check your babys position is this true ? If yes at how many weeks is that ? Im 34 weeks and my next doctors appointment is this Thursday. I will be asking my doctor that but for now i'm curious .