I don't think I have any good advice, and I think you probably already know all this stuff. But I just can't stand to see people in pain, so here goes:

It's a pretty common story that couples give up, adopt, and then a pregnancy comes. Try relaxing and adopt a pet to hug and play with while you wait for your solution.

Plenty of frozen embryos available, apparently. They freeze more than the original couple needed.

If you can find an agency that works with crisis pregnancies, there are open adoptions available now. The mother chooses the couple she wants to parent her child.

A lot of the women/girls who go for abortions don't actually want to destroy the child. They don't think they have the ability to take on the responsibility. In the old days, these mothers would either have a "shotgun" wedding (this was supposedly how Abe married Mary), go for a dangerous and illegal abortion, or go to a home for unwed mothers where a post birth adoption was arranged. The mother would not know where her baby went. Sometimes families would hide the pregnancy and a family member would pose as the mother. Today it is more common to either abort or become a single mother. Not so many are opting to adopt out, which is causing a baby shortage for adoptive parents. There are still organizations that work with crisis pregnancies. There is a need for more of these to support girls who don't know what to do other than seek an abortion. This is something I think churches should get involved in. It might help more young girls to choose not to abort. We are not living in the Victorian age when fallen women went to the workhouse and babies were forcibly taken from them.

I knew a man who was trained in Western medicine as well as Chinese medicine. He said he knew how to treat with Chinese medicine to make the "womb warm" to help pregnancy happen.

I have sometimes thought about being a foster parent. Considering the foster system can abuse families and children, you could do good by being available as godly foster parents. You might even meet a child/children that you want to adopt as your own.

Story of Hannah in the Bible. Also of Elizabeth, mother of John the Baptist, as well as Sarah, of course. And she was well past her fertile years.

I prayed for children. I had already been something of a mother to my younger siblings. I wasn't married at the right time and in the right situation to produce my own children. God gave me stepkids. I have a grandchild now. He is super cute. Plus a series of cats and a puppy, and some stints as a teacher, it is enough.

If you deeply desire to become parents, God will find a way. Godly parents make good parents.