It really depends on your doctor. For some people, the anatomy scan at mid-pregnancy is their last ultrasound unless something comes up. Some doctors do another ultrasound during 3rd trimester to check the baby's growth.
I'm just jealous that you've already had one! I only get one and that's at 20 weeks. My best friend is a vet and is begging me to let her put me on the puppy ultrasound (it's the same machine) to see if we can find the baby.
I think after the 20ish week anatomy scan, it is only then done if there is a concern and/or at the end to measure fluid levels to see if they need to induce or let you keep waiting for the baby to come on its own, check its size, etc.
Re: Ultrasound question
good question for your doctor because every ob/gyn group is different
Those were the only ones my doctor wanted me to have. But i think every OB might be different.
I had one at 8 weeks and another at 16 weeks...that will be it for me!