Jealous of my friends

My SO and I are friends with a couple who announced today on Facebook that they're pregnant. While I tried to be excited and happy for them I just couldnt bring myself to be. I cried for hours asking my SO what makes them so special, why can they have a baby but nothing seems to work for us. Every time I seen the pictures and the sonogram my heart just ached. It felt like someone had just stabbed me through the heart because I would give anything in this world to be as lucky as they are right now. I may sound like selfish and like a bad friend but I couldn't help it. I am glad that they are finally going to have a child of their own but I'm also so upset that I can't get that same happiness. We've only been TTC for 9 months and to some people that may seem so short but to me it's been a lifetime. I just worry that I'll never get my chance to be a mother and I'm taking away my SO's chance at being a father.