Dream sibling for Abby

My name is Lorraine and we are an animal loving family with one daughter. Our dream was to have at least two children so they could grow up together. Over the years the dream has been diminishing with miscarriages, along with other ongoing health issues between the two of us. Plus I'm now almost 41 so we have no time to wait before it's too late. I know there's no 100% chance but I don't want to look back years from now and feel that we didn't try everything possible before completely giving up our dream. Thank you