I've had mine scanned with all my pregnancies too. I thought it was just to check that they were the right size and in early pregnancy, I thought that the nutrients for the baby came from where the egg was released (before the placenta was formed) though I could be wrong because I don't understand it a great deal but I assumed that was part of why they do a scan of the ovaries to check that everything has functioned normally. Also because the ovary that provides the nutrients tends to swell a bit so they keep an eye on it's size.

I really don't know though that is all stuff I have assumed.

Congratulations on the rest of your scan going well. Glad to hear that you are growing a healthy bub