I think you can ask the donor co-ordinator if there have been any pregnancies from your donor. I did wonder about the sperm but then I had my DS from my first FET, and apparently there have been lots of pregnancies from the donor now.
I just haven't had any luck for number 2. We did ICSI to do PGS, to see if that was why. I have two normal embies but can't get to transfer. My FET cycles keep getting cancelled, I'm hoping the next one will get there!