Sorry I've been MIA. We have just moved house and I have had some Internet issues.
Okay to your questions:
The counsellor just went through the entire donor process with us to make sure bot DH and I and my sister and her fiancé were well aware of the process and that we were in full understanding of each of our legal rights with the child that may come of the donor. We were all in the room together and I felt 100% comfortable discussing it in full with them.
Both my sister and I were put on the mini pill and told to stop on the same date to sync up our cycles. Basically the last one to get their period was the ones who's dates we used. With us though I had a breakthrough bleed on the pill and when I stopped just spotted very lightly. She started a couple of days later so that was our day 1.
23 should be fine. I don't think that's too young. They were willing to use my 18 year old sister if need be.
My older sister (who's 32) had not yet finished having kids. She only had one as well. She actually put off trying again for me so she could donate instead. She started trying herself as soon as her cycle started up naturally again. Just be prepared that their cycles do get messed up a bit after donating. It took 6 months for my sister to get pregnant again (luckily it worked and she is now 17weeks behind me). I went into panic mode and thought I had ruined it for her to have any more kids. QFG said its normal for donors to take up to 6 months to fall naturally after donating eggs. Their systems go into shock a bit I think.
Anyway, just like my sister your niece is an angel too. My sister had the same thought pattern. It was worth the sacrifice for her too. And as the pregnancy goes on I don't even think twice about this not being my baby. I feel both the joys and the painful rib kicks now. I have been the one to go through this pregnancy. And I'm the one who has suffered horrible morning sickness to grow this baby. She calls me every week and we catch up on our pregnancies. There is no doubt in either of our minds who will parent this child. Although, I have to say, I wish I had her pregnancy. 1-2 weeks of nausea and then nothing. I was so sick and lost so much weight I thought I was going to die lol. Ah well, it is all worth it in the end.
8 Weeks to go till due date!!!!!!!!