I am so sorry that this is happening to you. You sound like you would be a wonderful mother but remember that being a mother doesn't always mean giving birth to a child.
My Grandparents have 5 children. My Grandma gave birth to two of her children and adopted her other three. My Grandma was very sick during both of her pregnancies and her doctor told her that she was not able to have any more babies. Her and my Grandpa desperately wanted a large family and so they chose adoption (1 girl and 2 boys). My Aunt was also unable to become pregnant and she adopted a baby from Guatemala.
There are a lot of babies and children without parents so if adoption is something you've thought about before maybe it's worth investigating?