I really remember those days of going through the cycle of hope then despair. I went through only one cycle of IVF, as there was only one available on the NHS, but we'd previously had 2 goes at IUI, which were both unsuccessful.
After the IVF, we didn't go through it again as I produced just one immature egg and I was told afterwards that I had only a 5% chance of producing a healthy baby through IVF.
We didn't want to use a de, but my DSis did make an offer to donate one of her eggs. This was of course tempting but I didn't want to put her through a cycle of IVF when she herself didn't have children. (She has had 2 birth children now so it might have been different if she'd already been a mum then, who knows.)
We then moved on to consider adoption, but we were advised to wait about 1 year to give us time to recover from the trauma. During this time I was diagnosed with depression, and I took longer to recover than I expected but I knew I was ready when I heard that my DSis was pregnant and just felt happy for her, with no twinge of jealousy. (My BIL's wife had gone through 3 pregnancies since my DH and I got married, and now had 5 children, and it used to really upset me.)
We then went through the arduous adoption process leading to us now having 2 lovely DDs, who are birth siblings. We applied to adopt DD2 because we really wanted them to be together.
I will say that it's a privilege to adopt but it is tough and you have to truly come to terms with being infertile first. And those stories people tell about women who become pregnant after adopting are totally unhelpful imho, because it's actually very rare and it doesn't help anyone to move past the pain of disappointment.