Do you ever feel like its unfair?

I am 28 years old and have only been TTC for 3 months but I can't help but feel a little frustrated when I see people I know get pregnant left and right without even trying. It feels unfair that some of my acquaintances with unhealthy and unstable lifestyles are expecting their 2nd or 3rd babies, and here I am with a dependable, loving husband, a steady job, making healthy and smart decisions, and I'm not pregnant yet.