What are the essential scans and tests you had done during pregnancy?

My medical aid does not cover all of it and I don’t want to waste money on unnecessary tests. Which scans and tests are most important, I want to do what is right for my baby. I get to have 3 scans covered and then “selected tests”, but it’s not specified. I will try to get a list but wanted to get some input on your experience and perspective on what is most important.

I have done my dating scan today, and will do the 14week scan with the NT testing as it is covered. Then anatomy scan?