Hi there,
I dont know what it is called but I once new a woman who could only carry female babies. Each time she had a child it was a girl, 3 in all ant the last was 16 years since the 2nd. She had several miscarriages in her time and thought the same thing, that she was only able to carry a girl.
I am sorry that I can not give any further insight into this, and I am sorry to find you in this place under the circumstances that we are all here.
I that you find the answers that you are looking for.
Take care
Kim