Nat, I'm really happy to hear the scans went well. I'm not sure how concerned you were about a possible issue but at least now you have an answer and its a good one and you can move on!
EmmaJane, very happy for you. I'm sure you will love SA and I hope you have success first time! I wouldn't worry about proven vs unproven donors. In the beginning it seemed important to us too but we came to realise that the definition of proven can actually be a bit loose. It could mean there was just a good number of eggs, it could mean that there was just one egg that happened to create a pregnancy, it could mean that there was a pregnancy even if it didn't continue. Personally I would try to have faith in the age of the donor and her hopefully good health. I don't know if you considered it but you can ask for her AMH to be tested. It costs about $60-$70AUD but it was money well spent for us as the donor we had originally chosen, whilst young, actually turned out to have an abnormally low AMH for her age. This is probably rare though and they would hopefully raise concerns to you after doing her Antral follicle count scan.
RoRo, hope you're getting on ok. Not long now.
I am 34+4 today, and I'm just home from my baby shower. On the home stretch now.