I'm so upset!

I'm 25 years old. Happily married. I've been with my husband since 2012 been married since 2013. Our wedding night we ditched condoms and have been trying for a baby ever since. Month after month I get my period. I have pcos and have to use Clomid to ovulate. I've used 3 rounds and still no luck but today I found out my 17 year old brother is going to be a dad. His girlfriend is 15. I'm balling my eyes out. How?? How is this fair?? I love my brother but I can't even look at him right now and I don't know if ill ever get passed it. Also, I should add I'm pissed because they were trying.