Sorry to hear that your ttc journey has taken some unexpected turns. I am in a way, in a very similar situation in that we can't have any more bio children. My only DS was an IVF success after 2yrs ttc with other treatments (including 4 rounds of clomid uip to 250mg that did nothing at all to my ovaries!). I have severe PCOS with no ovulation or menstruation cycle at all without injectable drugs, plus poor quality eggs as a result. Even though my DH is fine, my eggs just can't do their part. We've tried 6 fresh IVF, an IUI and an FET for baby #2 and only acheived 1 early miscarriage. Doing a DE cycle is just financially out of reach, especially since it's still no guarantee. So we were ready to move forward with domestic newborn adoption figuring even if we had to borrow against his retirement, it would be a definite and we were hopeful that we'd eventually come home with our baby to complete our family. Well, the starts aligned perfectly and thanks to a wonderful couple, we are in the process of receiving donated embryos. The genetic relation will in fact be just as if we had adopted, but I will get to care for the pregnancy from the very beginning and experience everything from a-z. The baby will also be created from my body, I will be providing the nutrients the baby needs to grow and develop so in a way, we will still share the biology of the process. I am so hopeful that this is going to work that I am almost positive. I believe this will bring me my last child(ren). If you are open to adoption, you might want to look into embryo donation or adoption. Just something to think about, it's a wonderful option and there are several agencies, clinics and programs that have embies available for donation or adoption. It is also much less expensive than doing a fresh IVF out of pocket or a DE cycle and also less expensive than newborn adoption. And to the people that are putting in their unwanted two cents, I would just be straight and honest with them and let them know that you and your DH are happy with your decision to adopt, their comments are hurtful and if you need their advice, you'll ask for it. Women that haven't gone through this, will never understand. Although if your mother-inlaw had to adopt due to infertility issues, I can't really understand her lack of compassion for your situation but I guess sometimes, people just don't think before they speak. It can be tough dealing with family and friends that think their silly advice about "not thinking about it so much" or saying "their friends daughter started looking into the adoption process and then got pregnant naturally so it can happen for you"...will in any way, help you relax, let alone conceive.
Good luck to you!! I hope you and your baby find each other very soon