It's not fair

I'm sorry, maybe I'm just bitter and jealous but it is seriously so unfair why people like this are able to bring so many children into the world but my fiance and I are having so much trouble getting pregnant. It makes me irate and wanna cry. I wish I could just understand. I wish I could figure out what the hell I ever did to deserve so much bad Karma in my life cuz I seriously don't know. These people don't understand how lucky they are to have these precious babies/children...yet they just put them in harms way? I'll never understand why them over me.