Secondary Infertility

I always thought that after I had my first child using the most expensive and most involved form of medical intervention possible that the second child wouldn’t be as hard. Boy was I wrong. My son was my first embryo transfer and he’s now 17 months old. I’ve now had one early miscarriage and 2 completely failed transfers trying for baby number 2. I’m getting extremely discouraged, but I’m also that much more grateful for my son with every failure. I just want him to have a sibling, but I’m starting to wonder if that’s possible.